diff --git a/app.go b/app.go
index 44e5bec..d98da03 100644
--- a/app.go
+++ b/app.go
@@ -622,7 +622,7 @@ func (a AppConfig) RunAppBackup() error {
 		return err
 	}
 
-	if schedule != "" {
+	if schedule != "" || *slowFlag {
 		err = a.CheckZFS()
 		if err != nil {
 			if *debugFlag {
@@ -630,7 +630,9 @@ func (a AppConfig) RunAppBackup() error {
 			}
 			return err
 		}
+	}
 
+	if schedule != "" {
 		err = a.ExecBefore(schedule)
 		if err != nil {
 			if *debugFlag {
diff --git a/backup.go b/backup.go
index 8b5fdb9..c54c845 100644
--- a/backup.go
+++ b/backup.go
@@ -31,6 +31,7 @@ var (
 	appFlag   = flag.String("app", "", "run specific app")
 	cfgFile   = flag.String("config", "config.json", "config file")
 	schedFlag = flag.String("schedule", "", "specific schedule")
+	slowFlag  = flag.Bool("slow", false, "slow process")
 	testFlag  = flag.Bool("test", false, "test run")
 	debugFlag = flag.Bool("debug", false, "debug")
 	cfg       Config