diff --git a/app.go b/app.go
new file mode 100644
index 0000000..e476a4d
--- /dev/null
+++ b/app.go
@@ -0,0 +1,576 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"regexp"
+	"time"
+)
+
+type AppConfig struct {
+	Name         string              `json:"name"`
+	Schedule     []string            `json:"schedule"`
+	Sources      []Location          `json:"src"`
+	Destinations []Location          `json:"dest"`
+	Before       map[string]Location `json:"before"`
+	After        map[string]Location `json:"after"`
+}
+
+func (a AppConfig) getTime() time.Time {
+	for _, v := range a.Sources {
+		return cfg.Box[v.Box()].ssh.now
+	}
+	for _, v := range a.Destinations {
+		return cfg.Box[v.Box()].ssh.now
+	}
+	return time.Now()
+}
+
+func (a AppConfig) getSchedule() (string, error) {
+	var schedule string
+	if *debugFlag {
+		log.Printf("AppConfig.getSchedule : %s : Start", a.Name)
+	}
+
+	refreshSnapshot := make(map[string]bool)
+	for _, v := range a.Sources {
+		refreshSnapshot[v.Box()] = true
+	}
+	for k, _ := range refreshSnapshot {
+		err := cfg.Box[k].ssh.getSnapshotList()
+		if err != nil {
+			if *debugFlag {
+				log.Printf("AppConfig.getSchedule : %s : getSnapshotList(%s) : %s", a.Name, k, err)
+			}
+			return "", err
+		}
+	}
+
+	if *schedFlag != "" {
+		schedule = *schedFlag
+	} else if a.needYearlySnapshot() {
+		schedule = "yearly"
+	} else if a.needMonthlySnapshot() {
+		schedule = "monthly"
+	} else if a.needWeeklySnapshot() {
+		schedule = "weekly"
+	} else if a.needDailySnapshot() {
+		schedule = "daily"
+	} else if a.needHourlySnapshot() {
+		schedule = "hourly"
+	} else {
+		return schedule, nil
+	}
+
+	if ret, ok := cfg.Zfsnap[schedule]; !ok {
+		return "", fmt.Errorf("no retention for %s", schedule)
+	} else {
+		re := regexp.MustCompile(`^([0-9]+[ymwdhMs]{1}|forever)$`)
+		if !re.MatchString(ret) {
+			return "", fmt.Errorf("wrong retention format for %s", schedule)
+		}
+	}
+	return schedule, nil
+}
+
+func (a AppConfig) needYearlySnapshot() bool {
+	if *debugFlag {
+		log.Printf("AppConfig.needYearlySnapshot : %s : Start", a.Name)
+	}
+	ret := false
+
+	// schedule enabled for app ?
+	for _, v := range a.Schedule {
+		if v == "yearly" {
+			ret = true
+		}
+	}
+	if !ret {
+		return false
+	}
+
+	// finding out the timestamps existing
+	timeSource := make(map[string]map[time.Time]struct{})
+	timeTotal := make(map[time.Time]struct{})
+	re := regexp.MustCompile(`^yearly-(?P<Date>[0-9]{4}-[0-9]{2}-[0-9]{2}_[0-9]{2}.[0-9]{2}.[0-9]{2})--([0-9]+[ymwdhMs]{1}|forever)$`)
+	for _, src := range a.Sources {
+		timeSource[string(src)] = make(map[time.Time]struct{})
+		for _, snap := range cfg.Box[src.Box()].ssh.snapshot {
+			if src.Path() == snap.Path() {
+				if re.MatchString(snap.Name()) {
+					dateString := re.ReplaceAllString(snap.Name(), "${Date}")
+					dateTime, err := time.Parse("2006-01-02_15.04.05", dateString)
+					if err != nil {
+						if *debugFlag {
+							log.Printf("AppConfig.needYearlySnapshot : %s : time.Parse(%s) : %s", a.Name, dateString, err)
+						}
+					} else {
+						timeSource[string(src)][dateTime] = struct{}{}
+						timeTotal[dateTime] = struct{}{}
+					}
+				}
+			}
+		}
+	}
+
+	// cleaning up the available timestamps for common timestamps
+	for t, _ := range timeTotal {
+		for _, v := range timeSource {
+			if _, ok := v[t]; !ok {
+				delete(timeTotal, t)
+			}
+		}
+	}
+
+	// finding an eligible timestamp
+	now := a.getTime()
+	for t, _ := range timeTotal {
+		if t.Year() == now.Year() {
+			return false
+		}
+	}
+
+	// no timestamp => need the snapshot !
+
+	return true
+}
+
+func (a AppConfig) needMonthlySnapshot() bool {
+	if *debugFlag {
+		log.Printf("AppConfig.needMonthlySnapshot : %s : Start", a.Name)
+	}
+	ret := false
+
+	// schedule enabled for app ?
+	for _, v := range a.Schedule {
+		if v == "monthly" {
+			ret = true
+		}
+	}
+	if !ret {
+		return false
+	}
+
+	// finding out the timestamps existing
+	timeSource := make(map[string]map[time.Time]struct{})
+	timeTotal := make(map[time.Time]struct{})
+	re := regexp.MustCompile(`^(yearly|monthly)-(?P<Date>[0-9]{4}-[0-9]{2}-[0-9]{2}_[0-9]{2}.[0-9]{2}.[0-9]{2})--([0-9]+[ymwdhMs]{1}|forever)$`)
+	for _, src := range a.Sources {
+		timeSource[string(src)] = make(map[time.Time]struct{})
+		for _, snap := range cfg.Box[src.Box()].ssh.snapshot {
+			if src.Path() == snap.Path() {
+				if re.MatchString(snap.Name()) {
+					dateString := re.ReplaceAllString(snap.Name(), "${Date}")
+					dateTime, err := time.Parse("2006-01-02_15.04.05", dateString)
+					if err != nil {
+						if *debugFlag {
+							log.Printf("AppConfig.needYearlySnapshot : %s : time.Parse(%s) : %s", a.Name, dateString, err)
+						}
+					} else {
+						timeSource[string(src)][dateTime] = struct{}{}
+						timeTotal[dateTime] = struct{}{}
+					}
+				}
+			}
+		}
+	}
+
+	// cleaning up the available timestamps for common timestamps
+	for t, _ := range timeTotal {
+		for _, v := range timeSource {
+			if _, ok := v[t]; !ok {
+				delete(timeTotal, t)
+			}
+		}
+	}
+
+	// finding an eligible timestamp
+	now := a.getTime()
+	for t, _ := range timeTotal {
+		if t.Year() == now.Year() && t.Month() == now.Month() {
+			return false
+		}
+	}
+
+	// no timestamp => need the snapshot !
+
+	return true
+}
+
+func (a AppConfig) needWeeklySnapshot() bool {
+	if *debugFlag {
+		log.Printf("AppConfig.needWeeklySnapshot : %s : Start", a.Name)
+	}
+	ret := false
+
+	// schedule enabled for app ?
+	for _, v := range a.Schedule {
+		if v == "weekly" {
+			ret = true
+		}
+	}
+	if !ret {
+		return false
+	}
+
+	// finding out the timestamps existing
+	timeSource := make(map[string]map[time.Time]struct{})
+	timeTotal := make(map[time.Time]struct{})
+	re := regexp.MustCompile(`^(yearly|monthly|weekly)-(?P<Date>[0-9]{4}-[0-9]{2}-[0-9]{2}_[0-9]{2}.[0-9]{2}.[0-9]{2})--([0-9]+[ymwdhMs]{1}|forever)$`)
+	for _, src := range a.Sources {
+		timeSource[string(src)] = make(map[time.Time]struct{})
+		for _, snap := range cfg.Box[src.Box()].ssh.snapshot {
+			if src.Path() == snap.Path() {
+				if re.MatchString(snap.Name()) {
+					dateString := re.ReplaceAllString(snap.Name(), "${Date}")
+					dateTime, err := time.Parse("2006-01-02_15.04.05", dateString)
+					if err != nil {
+						if *debugFlag {
+							log.Printf("AppConfig.needYearlySnapshot : %s : time.Parse(%s) : %s", a.Name, dateString, err)
+						}
+					} else {
+						timeSource[string(src)][dateTime] = struct{}{}
+						timeTotal[dateTime] = struct{}{}
+					}
+				}
+			}
+		}
+	}
+
+	// cleaning up the available timestamps for common timestamps
+	for t, _ := range timeTotal {
+		for _, v := range timeSource {
+			if _, ok := v[t]; !ok {
+				delete(timeTotal, t)
+			}
+		}
+	}
+
+	// finding an eligible timestamp
+	now := a.getTime()
+	nowYear, nowWeek := now.ISOWeek()
+	for t, _ := range timeTotal {
+		snapYear, snapWeek := t.ISOWeek()
+		if nowYear == snapYear && nowWeek == snapWeek {
+			return false
+		}
+	}
+
+	// no timestamp => need the snapshot !
+
+	return true
+}
+
+func (a AppConfig) needDailySnapshot() bool {
+	if *debugFlag {
+		log.Printf("AppConfig.needDailySnapshot : %s : Start", a.Name)
+	}
+	ret := false
+
+	// schedule enabled for app ?
+	for _, v := range a.Schedule {
+		if v == "daily" {
+			ret = true
+		}
+	}
+	if !ret {
+		return false
+	}
+
+	// finding out the timestamps existing
+	timeSource := make(map[string]map[time.Time]struct{})
+	timeTotal := make(map[time.Time]struct{})
+	re := regexp.MustCompile(`^(yearly|monthly|weekly|daily)-(?P<Date>[0-9]{4}-[0-9]{2}-[0-9]{2}_[0-9]{2}.[0-9]{2}.[0-9]{2})--([0-9]+[ymwdhMs]{1}|forever)$`)
+	for _, src := range a.Sources {
+		timeSource[string(src)] = make(map[time.Time]struct{})
+		for _, snap := range cfg.Box[src.Box()].ssh.snapshot {
+			if src.Path() == snap.Path() {
+				if re.MatchString(snap.Name()) {
+					dateString := re.ReplaceAllString(snap.Name(), "${Date}")
+					dateTime, err := time.Parse("2006-01-02_15.04.05", dateString)
+					if err != nil {
+						if *debugFlag {
+							log.Printf("AppConfig.needYearlySnapshot : %s : time.Parse(%s) : %s", a.Name, dateString, err)
+						}
+					} else {
+						timeSource[string(src)][dateTime] = struct{}{}
+						timeTotal[dateTime] = struct{}{}
+					}
+				}
+			}
+		}
+	}
+
+	// cleaning up the available timestamps for common timestamps
+	for t, _ := range timeTotal {
+		for _, v := range timeSource {
+			if _, ok := v[t]; !ok {
+				delete(timeTotal, t)
+			}
+		}
+	}
+
+	// finding an eligible timestamp
+	now := a.getTime()
+	for t, _ := range timeTotal {
+		if t.Year() == now.Year() && t.Month() == now.Month() && t.Day() == now.Day() {
+			return false
+		}
+	}
+
+	// no timestamp => need the snapshot !
+
+	return true
+}
+
+func (a AppConfig) needHourlySnapshot() bool {
+	if *debugFlag {
+		log.Printf("AppConfig.needHourlySnapshot : %s : Start", a.Name)
+	}
+	ret := false
+
+	// schedule enabled for app ?
+	for _, v := range a.Schedule {
+		if v == "hourly" {
+			ret = true
+		}
+	}
+	if !ret {
+		return false
+	}
+
+	// finding out the timestamps existing
+	timeSource := make(map[string]map[time.Time]struct{})
+	timeTotal := make(map[time.Time]struct{})
+	re := regexp.MustCompile(`^(yearly|monthly|weekly|daily|hourly)-(?P<Date>[0-9]{4}-[0-9]{2}-[0-9]{2}_[0-9]{2}.[0-9]{2}.[0-9]{2})--([0-9]+[ymwdhMs]{1}|forever)$`)
+	for _, src := range a.Sources {
+		timeSource[string(src)] = make(map[time.Time]struct{})
+		for _, snap := range cfg.Box[src.Box()].ssh.snapshot {
+			if src.Path() == snap.Path() {
+				if re.MatchString(snap.Name()) {
+					dateString := re.ReplaceAllString(snap.Name(), "${Date}")
+					dateTime, err := time.Parse("2006-01-02_15.04.05", dateString)
+					if err != nil {
+						if *debugFlag {
+							log.Printf("AppConfig.needYearlySnapshot : %s : time.Parse(%s) : %s", a.Name, dateString, err)
+						}
+					} else {
+						timeSource[string(src)][dateTime] = struct{}{}
+						timeTotal[dateTime] = struct{}{}
+					}
+				}
+			}
+		}
+	}
+
+	// cleaning up the available timestamps for common timestamps
+	for t, _ := range timeTotal {
+		for _, v := range timeSource {
+			if _, ok := v[t]; !ok {
+				delete(timeTotal, t)
+			}
+		}
+	}
+
+	// finding an eligible timestamp
+	now := a.getTime()
+	for t, _ := range timeTotal {
+		if t.Year() == now.Year() && t.Month() == now.Month() && t.Day() == now.Day() && t.Hour() == now.Hour() {
+			return false
+		}
+	}
+
+	// no timestamp => need the snapshot !
+
+	return true
+}
+
+func (a AppConfig) RunAppBackup() error {
+	if *debugFlag {
+		log.Printf("AppConfig.RunAppBackup : %s : Start", a.Name)
+	}
+	schedule, err := a.getSchedule()
+	if err != nil {
+		if *debugFlag {
+			log.Printf("AppConfig.RunAppBackup : %s : Error getting schedule : %s", a.Name, err)
+		}
+		return err
+	}
+	if schedule == "" {
+		return nil
+	}
+
+	for _, src := range a.Sources {
+		if !cfg.Box[src.Box()].ssh.isZFS(src.Path()) {
+			return fmt.Errorf("No path %s on source", string(src))
+		}
+		for _, dest := range a.Destinations {
+			if !cfg.Box[dest.Box()].ssh.isZFS(dest.Path() + "/" + src.Box() + "/" + src.Path()) {
+				err := cfg.Box[dest.Box()].ssh.createZFS(dest.Path() + "/" + src.Box() + "/" + src.Path())
+				if err != nil {
+					if *debugFlag {
+						log.Printf("AppConfig.RunAppBackup : %s : Error creating %s on %s", a.Name, dest.Path()+"/"+src.Box()+"/"+src.Path(), dest.Box())
+					}
+					return err
+				}
+			}
+		}
+	}
+	for k, v := range a.Before {
+		re := regexp.MustCompile(k)
+		if re.MatchString(schedule) {
+			err := cfg.Box[v.Box()].ssh.exec(v.Path())
+			if err != nil {
+				if *debugFlag {
+					log.Printf("AppConfig.RunAppBackup : %s : Error executing %s", a.Name, string(v))
+				}
+				return err
+			}
+		}
+	}
+
+	refreshSnapshot := make(map[string]bool)
+	takeSnapshot := make(map[string]string)
+	delSnapshot := make(map[string]string)
+	for _, v := range a.Sources {
+		takeSnapshot[v.Box()] = takeSnapshot[v.Box()] + " " + v.Path()
+		refreshSnapshot[v.Box()] = true
+		for _, v2 := range a.Destinations {
+			delSnapshot[v2.Box()] = delSnapshot[v2.Box()] + " " + v2.Path() + "/" + v.Box() + "/" + v.Path()
+		}
+	}
+	for k, v := range takeSnapshot {
+		if *debugFlag {
+			log.Printf("AppConfig.RunAppBackup : %s : taking snapshot on %s for %s", a.Name, k, v)
+		}
+		err := cfg.Box[k].ssh.exec("/usr/sbin/zfsnap snapshot -p " + schedule + "- -a " + cfg.Zfsnap[schedule] + v)
+		if err != nil {
+			if *debugFlag {
+				log.Printf("AppConfig.RunAppBackup : %s : Error executing zfsnap on %s", a.Name, k)
+			}
+			return err
+		}
+	}
+	for _, v := range a.Destinations {
+		refreshSnapshot[v.Box()] = true
+	}
+	for k, _ := range refreshSnapshot {
+		if *debugFlag {
+			log.Printf("AppConfig.RunAppBackup : %s : refreshing snapshots for source %s", a.Name, k)
+		}
+		err := cfg.Box[k].ssh.getSnapshotList()
+		if err != nil {
+			if *debugFlag {
+				log.Printf("AppConfig.RunAppBackup : %s : Error getting snapshots on %s", a.Name, k)
+			}
+			return err
+		}
+	}
+	for _, src := range a.Sources {
+		for _, dest := range a.Destinations {
+			if *debugFlag {
+				log.Printf("AppConfig.RunAppBackup : %s : Sending snapshots from %s to %s", a.Name, string(src), string(dest))
+			}
+			dLastSnapshot, err := cfg.Box[dest.Box()].ssh.getLastSnapshot(dest.Path() + "/" + src.Box() + "/" + src.Path())
+			if err != nil {
+				if *debugFlag {
+					log.Printf("AppConfig.RunAppBackup : %s : No snapshot for %s on %s", a.Name, string(src), dest.Box())
+				}
+				sFirstSnapshot, err := cfg.Box[src.Box()].ssh.getFirstSnapshot(src.Path())
+				if err != nil {
+					if *debugFlag {
+						log.Printf("AppConfig.RunAppBackup : %s : No snapshot for %s", a.Name, string(src))
+					}
+					return err
+				}
+				if *debugFlag {
+					log.Printf("AppConfig.RunAppBackup : %s : Initializing snapshot on %s from %s", a.Name, dest.Box(), string(sFirstSnapshot))
+				}
+				err = cfg.Box[dest.Box()].ssh.exec("/usr/bin/ssh root@" + src.Box() + " /sbin/zfs send " + string(sFirstSnapshot) + " | /sbin/zfs recv -F " + dest.Path() + "/" + src.Box() + "/" + src.Path())
+				if err != nil {
+					if *debugFlag {
+						log.Printf("AppConfig.RunAppBackup : %s : Initializing snapshot on %s from %s failed (%s)", a.Name, dest.Box(), string(sFirstSnapshot), err)
+					}
+					return err
+				}
+				var sCurrSnapshot Snapshot
+				sNextSnapshot := sFirstSnapshot
+				for !cfg.Box[src.Box()].ssh.isLastSnapshot(sNextSnapshot) {
+					sCurrSnapshot = sNextSnapshot
+					sNextSnapshot, err = cfg.Box[src.Box()].ssh.getNextSnapshot(sNextSnapshot)
+					if *debugFlag {
+						log.Printf("AppConfig.RunAppBackup : %s : Sending incrementally %s to %s", a.Name, string(sNextSnapshot), dest.Box())
+					}
+					err = cfg.Box[dest.Box()].ssh.exec("/usr/bin/ssh root@" + src.Box() + " /sbin/zfs send -I " + string(sCurrSnapshot) + " " + string(sNextSnapshot) + " | /sbin/zfs recv " + dest.Path() + "/" + src.Box() + "/" + src.Path())
+					if err != nil {
+						if *debugFlag {
+							log.Printf("AppConfig.RunAppBackup : %s : Sending snapshot on %s from %s failed (%s)", a.Name, dest.Box(), string(sNextSnapshot), err)
+						}
+						return err
+					}
+				}
+				if *debugFlag {
+					log.Printf("AppConfig.RunAppBackup : %s : All snapshots sent for %s", a.Name, string(src))
+				}
+
+			} else {
+				if *debugFlag {
+					log.Printf("AppConfig.RunAppBackup : %s : Last snapshot on %s is %s", a.Name, dest.Box(), string(dLastSnapshot))
+				}
+				var sCurrSnapshot Snapshot
+				sNextSnapshot := Snapshot(string(dLastSnapshot)[len(string(dest))+2:])
+				for !cfg.Box[src.Box()].ssh.isLastSnapshot(sNextSnapshot) {
+					sCurrSnapshot = sNextSnapshot
+					sNextSnapshot, err = cfg.Box[src.Box()].ssh.getNextSnapshot(sNextSnapshot)
+					if *debugFlag {
+						log.Printf("AppConfig.RunAppBackup : %s : Sending incrementally %s to %s", a.Name, string(sNextSnapshot), dest.Box())
+					}
+					err = cfg.Box[dest.Box()].ssh.exec("/usr/bin/ssh root@" + src.Box() + " /sbin/zfs send -I " + string(sCurrSnapshot) + " " + string(sNextSnapshot) + " | /sbin/zfs recv " + dest.Path() + "/" + src.Box() + "/" + src.Path())
+					if err != nil {
+						if *debugFlag {
+							log.Printf("AppConfig.RunAppBackup : %s : Sending snapshot on %s from %s failed (%s)", a.Name, dest.Box(), string(sNextSnapshot), err)
+						}
+						return err
+					}
+				}
+			}
+		}
+	}
+	for k, v := range takeSnapshot {
+		if *debugFlag {
+			log.Printf("AppConfig.RunAppBackup : %s : cleaning snapshot on %s for %s", a.Name, k, v)
+		}
+		err := cfg.Box[k].ssh.exec("/usr/sbin/zfsnap destroy -p hourly- -p daily- -p weekly- -p monthly- -p yearly- " + v)
+		if err != nil {
+			if *debugFlag {
+				log.Printf("AppConfig.RunAppBackup : %s : Error executing zfsnap on %s", a.Name, k)
+			}
+			return err
+		}
+	}
+	for k, v := range delSnapshot {
+		if *debugFlag {
+			log.Printf("AppConfig.RunAppBackup : %s : cleaning snapshot on %s for %s", a.Name, k, v)
+		}
+		err := cfg.Box[k].ssh.exec("/usr/sbin/zfsnap destroy -p hourly- -p daily- -p weekly- -p monthly- -p yearly- " + v)
+		if err != nil {
+			if *debugFlag {
+				log.Printf("AppConfig.RunAppBackup : %s : Error executing zfsnap on %s", a.Name, k)
+			}
+			return err
+		}
+	}
+	for k, v := range a.After {
+		re := regexp.MustCompile(k)
+		if re.MatchString(schedule) {
+			err := cfg.Box[v.Box()].ssh.exec(v.Path())
+			if err != nil {
+				if *debugFlag {
+					log.Printf("AppConfig.RunAppBackup : %s : Error executing %s on %s", a.Name, v.Path(), v.Box())
+				}
+				return err
+			}
+		}
+	}
+	return nil
+}
diff --git a/backup.go b/backup.go
index d6584c3..1acae0c 100644
--- a/backup.go
+++ b/backup.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"bytes"
-	"encoding/csv"
 	"encoding/json"
 	"flag"
 	"fmt"
@@ -10,46 +9,22 @@ import (
 	"log"
 	"os"
 	"regexp"
-	"strings"
-	"time"
 
 	"golang.org/x/crypto/ssh"
 )
 
 type Config struct {
-	Zfsnap map[string]string    `json:"zfsnap"`
-	Box    map[string]BoxConfig `json:"box"`
-	Apps   []AppConfig          `json:apps`
-	ssh    map[string]*SSHConfig
-}
-
-type Location string
-
-type Snapshot string
-
-type AppConfig struct {
-	Name         string              `json:"name"`
-	Schedule     []string            `json:"schedule"`
-	Sources      []Location          `json:"src"`
-	Destinations []Location          `json:"dest"`
-	Before       map[string]Location `json:"before"`
-	After        map[string]Location `json:"after"`
-}
-
-type SSHConfig struct {
-	signer   ssh.Signer
-	config   *ssh.ClientConfig
-	client   *ssh.Client
-	logged   bool
-	name     string
-	zfs      map[string]string
-	snapshot []Snapshot
+	Zfsnap   map[string]string     `json:"zfsnap"`
+	Box      map[string]*BoxConfig `json:"box"`
+	Apps     []AppConfig           `json:apps`
+	Timezone string                `json:"timezone"`
 }
 
 type BoxConfig struct {
 	Addr string `json:"addr"`
 	User string `json:"user"`
 	Key  string `json:"key"`
+	ssh  *SSHConfig
 }
 
 var (
@@ -60,38 +35,11 @@ var (
 	cfg       Config
 )
 
-func (l Location) Box() string {
-	s := strings.Split(string(l), `:`)
-	return s[0]
-}
-
-func (l Location) Path() string {
-	s := strings.Split(string(l), `:`)
-	return s[1]
-}
-
-func (l Location) Valid() bool {
-	s := strings.Split(string(l), `:`)
-	return len(s) == 2
-}
-
-func (s Snapshot) Path() string {
-	s2 := strings.Split(string(s), `@`)
-	return s2[0]
-}
-
-func (s Snapshot) Name() string {
-	s2 := strings.Split(string(s), `@`)
-	return s2[1]
-}
-
-func (s Snapshot) Append(path string) Snapshot {
-	s2 := strings.Split(string(s), `@`)
-	return Snapshot(s2[0] + "/" + path + "@" + s2[1])
-}
-
 //Load config from file
 func (c *Config) Load() error {
+	if *debugFlag {
+		log.Printf("SSHConfig.Load : Start")
+	}
 	b, err := ioutil.ReadFile(*cfgFile)
 	if err != nil {
 		if *debugFlag {
@@ -108,13 +56,12 @@ func (c *Config) Load() error {
 		return err
 	}
 
-	cfg.ssh = make(map[string]*SSHConfig)
 	for k, v := range c.Box {
 		s := &SSHConfig{
 			logged: false,
 			name:   k,
 		}
-		cfg.ssh[k] = s
+		v.ssh = s
 		keyRaw, err := ioutil.ReadFile(v.Key)
 		if err != nil {
 			if *debugFlag {
@@ -165,7 +112,8 @@ func (c *Config) Load() error {
 
 		var b bytes.Buffer
 		session.Stdout = &b
-		err = session.Run("/usr/sbin/zfsnap --version")
+
+		err = session.Run("TZ=\"" + cfg.Timezone + "\" /usr/sbin/zfsnap --version")
 		if err != nil {
 			if *debugFlag {
 				log.Printf("Config.Load : client.NewSession(%s) : %s", k, err)
@@ -177,7 +125,16 @@ func (c *Config) Load() error {
 		}
 		session.Close()
 		s.logged = true
+	}
 
+	for _, box := range c.Box {
+		err = box.ssh.getTime()
+		if err != nil {
+			if *debugFlag {
+				log.Printf("Config.Load : ssh.getTime() : %s", err)
+			}
+			return err
+		}
 	}
 
 	for _, app := range c.Apps {
@@ -185,7 +142,7 @@ func (c *Config) Load() error {
 			if !src.Valid() {
 				return fmt.Errorf("Source not valid : %s", string(src))
 			}
-			if _, ok := cfg.ssh[src.Box()]; !ok {
+			if _, ok := cfg.Box[src.Box()]; !ok {
 				return fmt.Errorf("No box defined for source : %s", string(src))
 			}
 		}
@@ -193,7 +150,7 @@ func (c *Config) Load() error {
 			if !dest.Valid() {
 				return fmt.Errorf("Destination not valid : %s", string(dest))
 			}
-			if _, ok := cfg.ssh[dest.Box()]; !ok {
+			if _, ok := cfg.Box[dest.Box()]; !ok {
 				return fmt.Errorf("No box defined for destination : %s", string(dest))
 			}
 		}
@@ -208,7 +165,7 @@ func (c *Config) Load() error {
 			if !before.Valid() {
 				return fmt.Errorf("Before not valid : %s", string(before))
 			}
-			if _, ok := cfg.ssh[before.Box()]; !ok {
+			if _, ok := cfg.Box[before.Box()]; !ok {
 				return fmt.Errorf("No box defined for before : %s", string(before))
 			}
 		}
@@ -223,7 +180,7 @@ func (c *Config) Load() error {
 			if !after.Valid() {
 				return fmt.Errorf("After not valid : %s", string(after))
 			}
-			if _, ok := cfg.ssh[after.Box()]; !ok {
+			if _, ok := cfg.Box[after.Box()]; !ok {
 				return fmt.Errorf("No box defined for after : %s", string(after))
 			}
 		}
@@ -237,449 +194,6 @@ func (c *Config) Close() error {
 	return nil
 }
 
-func (s *SSHConfig) getLastSnapshot(path string) (Snapshot, error) {
-	if *debugFlag {
-		log.Printf("SSHConfig.getLastSnapshot : Start %s:%s (%d snapshots)", s.name, path, len(s.snapshot))
-	}
-	var last Snapshot
-	for _, v := range s.snapshot {
-		if v.Path() == path {
-			last = v
-		} else {
-			if len(string(last)) > 0 {
-				return last, nil
-			}
-		}
-	}
-	if len(string(last)) > 0 {
-		return last, nil
-	}
-	return last, fmt.Errorf("no snapshot")
-}
-
-func (s *SSHConfig) isLastSnapshot(snapshot Snapshot) bool {
-	if *debugFlag {
-		log.Printf("SSHConfig.isLastSnapshot : Start %s:%s", s.name, string(snapshot))
-	}
-	_, err := s.getNextSnapshot(snapshot)
-	if err != nil {
-		return true
-	} else {
-		return false
-	}
-}
-
-func (s *SSHConfig) getFirstSnapshot(path string) (Snapshot, error) {
-	if *debugFlag {
-		log.Printf("SSHConfig.getFirstSnapshot : Start %s:%s", s.name, path)
-	}
-	var first Snapshot
-	for _, v := range s.snapshot {
-		if v.Path() == path {
-			first = v
-			return first, nil
-		}
-	}
-	return first, fmt.Errorf("no snapshot")
-}
-
-func (s *SSHConfig) getNextSnapshot(snapshot Snapshot) (Snapshot, error) {
-	if *debugFlag {
-		log.Printf("SSHConfig.getNextSnapshot : Start %s:%s", s.name, string(snapshot))
-	}
-	var next Snapshot
-	for id, v := range s.snapshot {
-		if v == snapshot {
-			if len(s.snapshot) > id+1 {
-				next = s.snapshot[id+1]
-				if next.Path() == snapshot.Path() {
-					return next, nil
-				} else {
-					return next, fmt.Errorf("no snapshot")
-				}
-			} else {
-				return next, fmt.Errorf("no snapshot")
-			}
-		}
-	}
-	return next, fmt.Errorf("no snapshot")
-}
-
-func (s *SSHConfig) getSnapshotList() error {
-	if *debugFlag {
-		log.Printf("SSHConfig.getSnapshotList : %s : Start", s.name)
-	}
-	if !s.logged {
-		return fmt.Errorf("Client %s not logged in.", s.name)
-	}
-
-	session, err := s.client.NewSession()
-	if err != nil {
-		if *debugFlag {
-			log.Printf("SSHConfig.getSnapshotList : %s : client.NewSession() : %s", s.name, err)
-		}
-		return err
-	}
-
-	var b bytes.Buffer
-	session.Stdout = &b
-	err = session.Run("/usr/sbin/zfs list -H -t snapshot -o name")
-	if err != nil {
-		if *debugFlag {
-			log.Printf("SSHConfig.getSnapshotList : %s : session.Run() : %s", s.name, err)
-		}
-		return err
-	}
-
-	s.snapshot = make([]Snapshot, 0)
-
-	csvReader := csv.NewReader(&b)
-	csvReader.Comma = '\t'
-	csvReader.FieldsPerRecord = 1
-
-	csvData, err := csvReader.ReadAll()
-	if err != nil {
-		if *debugFlag {
-			log.Printf("SSHConfig.getSnapshotList : %s : csvReader.ReadAll() : %s", s.name, err)
-		}
-		return err
-	}
-
-	for _, rec := range csvData {
-		s.snapshot = append(s.snapshot, Snapshot(rec[0]))
-	}
-
-	if *debugFlag {
-		log.Printf("SSHConfig.getSnapshotList : %s : read %d zfs snapshots", s.name, len(s.snapshot))
-	}
-
-	session.Close()
-
-	return nil
-}
-
-func (s *SSHConfig) getZFSList() error {
-	if *debugFlag {
-		log.Printf("SSHConfig.getZFSList : Start %s", s.name)
-	}
-	if !s.logged {
-		return fmt.Errorf("Client %s not logged in.", s.name)
-	}
-
-	session, err := s.client.NewSession()
-	if err != nil {
-		if *debugFlag {
-			log.Printf("SSHConfig.getZFSList : client.NewSession(%s) : %s", s.name, err)
-		}
-		return err
-	}
-
-	var b bytes.Buffer
-	session.Stdout = &b
-	err = session.Run("/sbin/zfs list -H -o name,mountpoint")
-	if err != nil {
-		if *debugFlag {
-			log.Printf("SSHConfig.getZFSList : session.Run(%s) : %s", s.name, err)
-		}
-		return err
-	}
-
-	s.zfs = make(map[string]string)
-
-	csvReader := csv.NewReader(&b)
-	csvReader.Comma = '\t'
-	csvReader.FieldsPerRecord = 2
-
-	csvData, err := csvReader.ReadAll()
-	if err != nil {
-		if *debugFlag {
-			log.Printf("SSHConfig.getZFSList : csvReader.ReadAll(%s) : %s", s.name, err)
-		}
-		return err
-	}
-
-	for _, rec := range csvData {
-		s.zfs[rec[0]] = rec[1]
-	}
-
-	if *debugFlag {
-		log.Printf("SSHConfig.getZFSList : %s : read %d zfs file systems", s.name, len(s.zfs))
-	}
-
-	session.Close()
-
-	return nil
-
-}
-
-func (s *SSHConfig) isZFS(path string) bool {
-	if *debugFlag {
-		log.Printf("SSHConfig.isZFS : Start %s:%s", s.name, path)
-	}
-	if len(s.zfs) == 0 {
-		err := s.getZFSList()
-		if err != nil {
-			if *debugFlag {
-				log.Printf("SSHConfig.isZFS : s.getZFSList(%s) : %s", s.name, err)
-			}
-			return false
-		}
-	}
-	_, ok := s.zfs[path]
-	if ok {
-		return true
-	}
-	return false
-}
-
-func (s *SSHConfig) exec(cmd string) error {
-	if *debugFlag {
-		log.Printf("SSHConfig.exec : Start %s on %s", cmd, s.name)
-	}
-
-	session, err := s.client.NewSession()
-	if err != nil {
-		if *debugFlag {
-			log.Printf("SSHConfig.exec : client(%s).NewSession(%s) : %s", s.name, cmd, err)
-		}
-		return err
-	}
-
-	err = session.Run(cmd)
-	if err != nil {
-		if *debugFlag {
-			log.Printf("SSHConfig.exec : session(%s).Run(%s) : %s", s.name, cmd, err)
-		}
-		return err
-	}
-
-	session.Close()
-
-	return nil
-}
-
-func (s *SSHConfig) createZFS(path string) error {
-	if *debugFlag {
-		log.Printf("SSHConfig.createZFS : Start %s:%s", s.name, path)
-	}
-	if len(s.zfs) == 0 {
-		err := s.getZFSList()
-		if err != nil {
-			if *debugFlag {
-				log.Printf("SSHConfig.createZFS : s.getZFSList(%s) : %s", s.name, err)
-			}
-			return err
-		}
-	}
-	p := strings.Split(path, `/`)
-	var base string
-	for _, d := range p {
-		if base == "" {
-			base = d
-		} else {
-			base = base + `/` + d
-		}
-		if _, ok := s.zfs[base]; !ok {
-
-			if *debugFlag {
-				log.Printf("SSHConfig.createZFS : Creating %s:%s", s.name, base)
-			}
-
-			err := s.exec("/sbin/zfs create -o mountpoint=none " + base)
-			if err != nil {
-				if *debugFlag {
-					log.Printf("SSHConfig.createZFS : s.exec(%s) : %s", s.name, err)
-				}
-				return err
-			}
-
-			s.zfs[base] = "none"
-		}
-	}
-
-	return nil
-
-}
-
-func (a AppConfig) RunAppSchedule(schedule string) error {
-	if *debugFlag {
-		log.Printf("RunAppSchedule(%s) : %s : Start", a.Name, schedule)
-	}
-	for _, src := range a.Sources {
-		if !cfg.ssh[src.Box()].isZFS(src.Path()) {
-			return fmt.Errorf("No path %s on source", string(src))
-		}
-		for _, dest := range a.Destinations {
-			if !cfg.ssh[dest.Box()].isZFS(dest.Path() + "/" + src.Box() + "/" + src.Path()) {
-				err := cfg.ssh[dest.Box()].createZFS(dest.Path() + "/" + src.Box() + "/" + src.Path())
-				if err != nil {
-					if *debugFlag {
-						log.Printf("RunAppSchedule(%s) : %s : Error creating %s on %s", a.Name, schedule, dest.Path()+"/"+src.Box()+"/"+src.Path(), dest.Box())
-					}
-					return err
-				}
-			}
-		}
-	}
-	for k, v := range a.Before {
-		re := regexp.MustCompile(k)
-		if re.MatchString(schedule) {
-			err := cfg.ssh[v.Box()].exec(v.Path())
-			if err != nil {
-				if *debugFlag {
-					log.Printf("RunAppSchedule(%s) : %s : Error executing %s", a.Name, schedule, string(v))
-				}
-				return err
-			}
-		}
-	}
-
-	refreshSnapshot := make(map[string]bool)
-	takeSnapshot := make(map[string]string)
-	delSnapshot := make(map[string]string)
-	for _, v := range a.Sources {
-		takeSnapshot[v.Box()] = takeSnapshot[v.Box()] + " " + v.Path()
-		refreshSnapshot[v.Box()] = true
-		for _, v2 := range a.Destinations {
-			delSnapshot[v2.Box()] = delSnapshot[v2.Box()] + " " + v2.Path() + "/" + v.Box() + "/" + v.Path()
-		}
-	}
-	for k, v := range takeSnapshot {
-		if *debugFlag {
-			log.Printf("RunAppSchedule(%s) : %s : taking snapshot on %s for %s", a.Name, schedule, k, v)
-		}
-		err := cfg.ssh[k].exec("/usr/sbin/zfsnap snapshot -a " + cfg.Zfsnap[schedule] + v)
-		if err != nil {
-			if *debugFlag {
-				log.Printf("RunAppSchedule(%s) : %s : Error executing zfsnap on %s", a.Name, schedule, k)
-			}
-			return err
-		}
-	}
-	for _, v := range a.Destinations {
-		refreshSnapshot[v.Box()] = true
-	}
-	for k, _ := range refreshSnapshot {
-		if *debugFlag {
-			log.Printf("RunAppSchedule(%s) : %s : refreshing snapshots for source %s", a.Name, schedule, k)
-		}
-		err := cfg.ssh[k].getSnapshotList()
-		if err != nil {
-			if *debugFlag {
-				log.Printf("RunAppSchedule(%s) : %s : Error getting snapshots on %s", a.Name, schedule, k)
-			}
-			return err
-		}
-	}
-	for _, src := range a.Sources {
-		for _, dest := range a.Destinations {
-			if *debugFlag {
-				log.Printf("RunAppSchedule(%s) : %s : Sending snapshots from %s to %s", a.Name, schedule, string(src), string(dest))
-			}
-			dLastSnapshot, err := cfg.ssh[dest.Box()].getLastSnapshot(dest.Path() + "/" + src.Box() + "/" + src.Path())
-			if err != nil {
-				if *debugFlag {
-					log.Printf("RunAppSchedule(%s) : %s : No snapshot for %s on %s", a.Name, schedule, string(src), dest.Box())
-				}
-				sFirstSnapshot, err := cfg.ssh[src.Box()].getFirstSnapshot(src.Path())
-				if err != nil {
-					if *debugFlag {
-						log.Printf("RunAppSchedule(%s) : %s : No snapshot for %s", a.Name, schedule, string(src))
-					}
-					return err
-				}
-				if *debugFlag {
-					log.Printf("RunAppSchedule(%s) : %s : Initializing snapshot on %s from %s", a.Name, schedule, dest.Box(), string(sFirstSnapshot))
-				}
-				err = cfg.ssh[dest.Box()].exec("/usr/bin/ssh root@" + src.Box() + " /sbin/zfs send " + string(sFirstSnapshot) + " | /sbin/zfs recv -F " + dest.Path() + "/" + src.Box() + "/" + src.Path())
-				if err != nil {
-					if *debugFlag {
-						log.Printf("RunAppSchedule(%s) : %s : Initializing snapshot on %s from %s failed (%s)", a.Name, schedule, dest.Box(), string(sFirstSnapshot), err)
-					}
-					return err
-				}
-				var sCurrSnapshot Snapshot
-				sNextSnapshot := sFirstSnapshot
-				for !cfg.ssh[src.Box()].isLastSnapshot(sNextSnapshot) {
-					sCurrSnapshot = sNextSnapshot
-					sNextSnapshot, err = cfg.ssh[src.Box()].getNextSnapshot(sNextSnapshot)
-					if *debugFlag {
-						log.Printf("RunAppSchedule(%s) : %s : Sending incrementally %s to %s", a.Name, schedule, string(sNextSnapshot), dest.Box())
-					}
-					err = cfg.ssh[dest.Box()].exec("/usr/bin/ssh root@" + src.Box() + " /sbin/zfs send -I " + string(sCurrSnapshot) + " " + string(sNextSnapshot) + " | /sbin/zfs recv " + dest.Path() + "/" + src.Box() + "/" + src.Path())
-					if err != nil {
-						if *debugFlag {
-							log.Printf("RunAppSchedule(%s) : %s : Sending snapshot on %s from %s failed (%s)", a.Name, schedule, dest.Box(), string(sNextSnapshot), err)
-						}
-						return err
-					}
-				}
-				if *debugFlag {
-					log.Printf("RunAppSchedule(%s) : %s : All snapshots sent for %s", a.Name, schedule, string(src))
-				}
-
-			} else {
-				if *debugFlag {
-					log.Printf("RunAppSchedule(%s) : %s : Last snapshot on %s is %s", a.Name, schedule, dest.Box(), string(dLastSnapshot))
-				}
-				var sCurrSnapshot Snapshot
-				sNextSnapshot := Snapshot(string(dLastSnapshot)[len(string(dest))+2:])
-				for !cfg.ssh[src.Box()].isLastSnapshot(sNextSnapshot) {
-					sCurrSnapshot = sNextSnapshot
-					sNextSnapshot, err = cfg.ssh[src.Box()].getNextSnapshot(sNextSnapshot)
-					if *debugFlag {
-						log.Printf("RunAppSchedule(%s) : %s : Sending incrementally %s to %s", a.Name, schedule, string(sNextSnapshot), dest.Box())
-					}
-					err = cfg.ssh[dest.Box()].exec("/usr/bin/ssh root@" + src.Box() + " /sbin/zfs send -I " + string(sCurrSnapshot) + " " + string(sNextSnapshot) + " | /sbin/zfs recv " + dest.Path() + "/" + src.Box() + "/" + src.Path())
-					if err != nil {
-						if *debugFlag {
-							log.Printf("RunAppSchedule(%s) : %s : Sending snapshot on %s from %s failed (%s)", a.Name, schedule, dest.Box(), string(sNextSnapshot), err)
-						}
-						return err
-					}
-				}
-			}
-		}
-	}
-	for k, v := range takeSnapshot {
-		if *debugFlag {
-			log.Printf("RunAppSchedule(%s) : %s : cleaning snapshot on %s for %s", a.Name, schedule, k, v)
-		}
-		err := cfg.ssh[k].exec("/usr/sbin/zfsnap destroy" + v)
-		if err != nil {
-			if *debugFlag {
-				log.Printf("RunAppSchedule(%s) : %s : Error executing zfsnap on %s", a.Name, schedule, k)
-			}
-			return err
-		}
-	}
-	for k, v := range delSnapshot {
-		if *debugFlag {
-			log.Printf("RunAppSchedule(%s) : %s : cleaning snapshot on %s for %s", a.Name, schedule, k, v)
-		}
-		err := cfg.ssh[k].exec("/usr/sbin/zfsnap destroy" + v)
-		if err != nil {
-			if *debugFlag {
-				log.Printf("RunAppSchedule(%s) : %s : Error executing zfsnap on %s", a.Name, schedule, k)
-			}
-			return err
-		}
-	}
-	for k, v := range a.After {
-		re := regexp.MustCompile(k)
-		if re.MatchString(schedule) {
-			err := cfg.ssh[v.Box()].exec(v.Path())
-			if err != nil {
-				if *debugFlag {
-					log.Printf("RunAppSchedule(%s) : %s : Error executing %s on %s", a.Name, schedule, v.Path(), v.Box())
-				}
-				return err
-			}
-		}
-	}
-	return nil
-}
-
 func main() {
 	flag.Parse()
 
@@ -689,48 +203,26 @@ func main() {
 		os.Exit(1)
 	}
 
-	schedule := *schedFlag
-	if schedule == "" {
-		log.Printf("Main : Finding out schedule.")
-		now := time.Now()
-		if now.Day() == 1 && int(now.Month()) == 1 {
-			schedule = "yearly"
-		} else if now.Day() == 1 {
-			schedule = "monthly"
-		} else if now.Weekday().String() == "Monday" {
-			schedule = "weekly"
-		} else {
-			schedule = "daily"
-		}
-	}
-
-	err = RunSchedule(schedule)
+	err = RunBackup()
 	if err != nil {
 		log.Printf("Cannot run schedule (%s)", err)
 		os.Exit(1)
 	}
 }
 
-//RunSchedule run all backup targets where schedule is registered
-func RunSchedule(schedule string) error {
+//RunBackup run all backup targets where schedule is registered
+func RunBackup() error {
 	if *debugFlag {
-		log.Printf("RunSchedule(%s) : Start", schedule)
-	}
-	if _, ok := cfg.Zfsnap[schedule]; !ok {
-		return fmt.Errorf("No retention defined for %s schedule", schedule)
+		log.Printf("RunBackup() : Start")
 	}
 
 	for _, app := range cfg.Apps {
-		for _, schedName := range app.Schedule {
-			if schedName == schedule {
-				err := app.RunAppSchedule(schedule)
-				if err != nil {
-					if *debugFlag {
-						log.Printf("RunSchedule(%s) : Error running %s", schedule, app.Name)
-					}
-					return err
-				}
+		err := app.RunAppBackup()
+		if err != nil {
+			if *debugFlag {
+				log.Printf("RunBackup() : Error running %s", app.Name)
 			}
+			return err
 		}
 	}
 
diff --git a/location.go b/location.go
new file mode 100644
index 0000000..3d8f8af
--- /dev/null
+++ b/location.go
@@ -0,0 +1,20 @@
+package main
+
+import "strings"
+
+type Location string
+
+func (l Location) Box() string {
+	s := strings.Split(string(l), `:`)
+	return s[0]
+}
+
+func (l Location) Path() string {
+	s := strings.Split(string(l), `:`)
+	return s[1]
+}
+
+func (l Location) Valid() bool {
+	s := strings.Split(string(l), `:`)
+	return len(s) == 2
+}
diff --git a/snapshot.go b/snapshot.go
new file mode 100644
index 0000000..a8f65aa
--- /dev/null
+++ b/snapshot.go
@@ -0,0 +1,20 @@
+package main
+
+import "strings"
+
+type Snapshot string
+
+func (s Snapshot) Path() string {
+	s2 := strings.Split(string(s), `@`)
+	return s2[0]
+}
+
+func (s Snapshot) Name() string {
+	s2 := strings.Split(string(s), `@`)
+	return s2[1]
+}
+
+func (s Snapshot) Append(path string) Snapshot {
+	s2 := strings.Split(string(s), `@`)
+	return Snapshot(s2[0] + "/" + path + "@" + s2[1])
+}
diff --git a/ssh.go b/ssh.go
new file mode 100644
index 0000000..3c20023
--- /dev/null
+++ b/ssh.go
@@ -0,0 +1,331 @@
+package main
+
+import (
+	"bytes"
+	"encoding/csv"
+	"fmt"
+	"log"
+	"strings"
+	"time"
+
+	"golang.org/x/crypto/ssh"
+)
+
+type SSHConfig struct {
+	signer   ssh.Signer
+	config   *ssh.ClientConfig
+	client   *ssh.Client
+	logged   bool
+	name     string
+	zfs      map[string]string
+	snapshot []Snapshot
+	now      time.Time
+}
+
+func (s *SSHConfig) getLastSnapshot(path string) (Snapshot, error) {
+	if *debugFlag {
+		log.Printf("SSHConfig.getLastSnapshot : Start %s:%s (%d snapshots)", s.name, path, len(s.snapshot))
+	}
+	var last Snapshot
+	for _, v := range s.snapshot {
+		if v.Path() == path {
+			last = v
+		} else {
+			if len(string(last)) > 0 {
+				return last, nil
+			}
+		}
+	}
+	if len(string(last)) > 0 {
+		return last, nil
+	}
+	return last, fmt.Errorf("no snapshot")
+}
+
+func (s *SSHConfig) isLastSnapshot(snapshot Snapshot) bool {
+	if *debugFlag {
+		log.Printf("SSHConfig.isLastSnapshot : Start %s:%s", s.name, string(snapshot))
+	}
+	_, err := s.getNextSnapshot(snapshot)
+	if err != nil {
+		return true
+	} else {
+		return false
+	}
+}
+
+func (s *SSHConfig) getFirstSnapshot(path string) (Snapshot, error) {
+	if *debugFlag {
+		log.Printf("SSHConfig.getFirstSnapshot : Start %s:%s", s.name, path)
+	}
+	var first Snapshot
+	for _, v := range s.snapshot {
+		if v.Path() == path {
+			first = v
+			return first, nil
+		}
+	}
+	return first, fmt.Errorf("no snapshot")
+}
+
+func (s *SSHConfig) getNextSnapshot(snapshot Snapshot) (Snapshot, error) {
+	if *debugFlag {
+		log.Printf("SSHConfig.getNextSnapshot : Start %s:%s", s.name, string(snapshot))
+	}
+	var next Snapshot
+	for id, v := range s.snapshot {
+		if v == snapshot {
+			if len(s.snapshot) > id+1 {
+				next = s.snapshot[id+1]
+				if next.Path() == snapshot.Path() {
+					return next, nil
+				} else {
+					return next, fmt.Errorf("no snapshot")
+				}
+			} else {
+				return next, fmt.Errorf("no snapshot")
+			}
+		}
+	}
+	return next, fmt.Errorf("no snapshot")
+}
+
+func (s *SSHConfig) getSnapshotList() error {
+	if *debugFlag {
+		log.Printf("SSHConfig.getSnapshotList : %s : Start", s.name)
+	}
+	if !s.logged {
+		return fmt.Errorf("Client %s not logged in.", s.name)
+	}
+
+	session, err := s.client.NewSession()
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getSnapshotList : %s : client.NewSession() : %s", s.name, err)
+		}
+		return err
+	}
+
+	var b bytes.Buffer
+	session.Stdout = &b
+
+	err = session.Run("TZ=\"" + cfg.Timezone + "\" /usr/sbin/zfs list -H -t snapshot -o name")
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getSnapshotList : %s : session.Run() : %s", s.name, err)
+		}
+		return err
+	}
+
+	s.snapshot = make([]Snapshot, 0)
+
+	csvReader := csv.NewReader(&b)
+	csvReader.Comma = '\t'
+	csvReader.FieldsPerRecord = 1
+
+	csvData, err := csvReader.ReadAll()
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getSnapshotList : %s : csvReader.ReadAll() : %s", s.name, err)
+		}
+		return err
+	}
+
+	for _, rec := range csvData {
+		s.snapshot = append(s.snapshot, Snapshot(rec[0]))
+	}
+
+	if *debugFlag {
+		log.Printf("SSHConfig.getSnapshotList : %s : read %d zfs snapshots", s.name, len(s.snapshot))
+	}
+
+	session.Close()
+
+	return nil
+}
+
+func (s *SSHConfig) getZFSList() error {
+	if *debugFlag {
+		log.Printf("SSHConfig.getZFSList : %s : Start", s.name)
+	}
+	if !s.logged {
+		return fmt.Errorf("Client %s not logged in.", s.name)
+	}
+
+	session, err := s.client.NewSession()
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getZFSList : %s : client.NewSession() : %s", s.name, err)
+		}
+		return err
+	}
+
+	var b bytes.Buffer
+	session.Stdout = &b
+
+	err = session.Run("TZ=\"" + cfg.Timezone + "\" /sbin/zfs list -H -o name,mountpoint")
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getZFSList : %s : session.Run() : %s", s.name, err)
+		}
+		return err
+	}
+
+	s.zfs = make(map[string]string)
+
+	csvReader := csv.NewReader(&b)
+	csvReader.Comma = '\t'
+	csvReader.FieldsPerRecord = 2
+
+	csvData, err := csvReader.ReadAll()
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getZFSList : %s : csvReader.ReadAll() : %s", s.name, err)
+		}
+		return err
+	}
+
+	for _, rec := range csvData {
+		s.zfs[rec[0]] = rec[1]
+	}
+
+	if *debugFlag {
+		log.Printf("SSHConfig.getZFSList : %s : read %d zfs file systems", s.name, len(s.zfs))
+	}
+
+	session.Close()
+
+	return nil
+
+}
+
+func (s *SSHConfig) isZFS(path string) bool {
+	if *debugFlag {
+		log.Printf("SSHConfig.isZFS : Start %s:%s", s.name, path)
+	}
+	if len(s.zfs) == 0 {
+		err := s.getZFSList()
+		if err != nil {
+			if *debugFlag {
+				log.Printf("SSHConfig.isZFS : s.getZFSList(%s) : %s", s.name, err)
+			}
+			return false
+		}
+	}
+	_, ok := s.zfs[path]
+	if ok {
+		return true
+	}
+	return false
+}
+
+func (s *SSHConfig) getTime() error {
+	if *debugFlag {
+		log.Printf("SSHConfig.getTime : %s : Start", s.name)
+	}
+
+	session, err := s.client.NewSession()
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getTime :  %s : client.NewSession() : %s", s.name, err)
+		}
+		return err
+	}
+
+	var b bytes.Buffer
+	session.Stdout = &b
+
+	err = session.Run("TZ=\"" + cfg.Timezone + "\" /usr/bin/date +\"%F %T\"")
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getTime : %s : session.Run() : %s", s.name, err)
+		}
+		return err
+	}
+
+	s.now, err = time.Parse("2006-01-02 15:04:05\n", b.String())
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.getTime : %s : time.Parse() : %s", s.name, err)
+		}
+		return err
+	}
+
+	if *debugFlag {
+		log.Printf("SSHConfig.getTime : %s : now is %s", s.name, s.now.String())
+	}
+
+	session.Close()
+
+	return nil
+
+}
+
+func (s *SSHConfig) exec(cmd string) error {
+	if *debugFlag {
+		log.Printf("SSHConfig.exec : %s : Start %s", s.name, cmd)
+	}
+
+	session, err := s.client.NewSession()
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.exec : %s : client().NewSession(%s) : %s", s.name, cmd, err)
+		}
+		return err
+	}
+
+	err = session.Run("TZ=\"" + cfg.Timezone + "\" " + cmd)
+	if err != nil {
+		if *debugFlag {
+			log.Printf("SSHConfig.exec : session(%s).Run(%s) : %s", s.name, cmd, err)
+		}
+		return err
+	}
+
+	session.Close()
+
+	return nil
+}
+
+func (s *SSHConfig) createZFS(path string) error {
+	if *debugFlag {
+		log.Printf("SSHConfig.createZFS : Start %s:%s", s.name, path)
+	}
+	if len(s.zfs) == 0 {
+		err := s.getZFSList()
+		if err != nil {
+			if *debugFlag {
+				log.Printf("SSHConfig.createZFS : s.getZFSList(%s) : %s", s.name, err)
+			}
+			return err
+		}
+	}
+	p := strings.Split(path, `/`)
+	var base string
+	for _, d := range p {
+		if base == "" {
+			base = d
+		} else {
+			base = base + `/` + d
+		}
+		if _, ok := s.zfs[base]; !ok {
+
+			if *debugFlag {
+				log.Printf("SSHConfig.createZFS : Creating %s:%s", s.name, base)
+			}
+
+			err := s.exec("/sbin/zfs create -o mountpoint=none " + base)
+			if err != nil {
+				if *debugFlag {
+					log.Printf("SSHConfig.createZFS : s.exec(%s) : %s", s.name, err)
+				}
+				return err
+			}
+
+			s.zfs[base] = "none"
+		}
+	}
+
+	return nil
+
+}