did you check if cron was running?

crontab comes under the cygwin..
for crontab ,cywin should b continously running??? is there an issue

see post #42 http://www.linuxquestions.org/questi...ml#post5343710

i typed in cygwin terminal: cron-config

output:
The cron daemon can run as a service or as a job. The latter is not recommended.
Cron is already installed as a service under account LocalSystem.
Installation path: C:\cygwin is not for this instance of Cygwin.
You must remove and reinstall the service to run in this instance.
Do you want to remove or reinstall it? (yes/no)

i typed: net start cron

output:
System error 2 has occurred.

The system cannot find the file specified.

what should i do??? i dont knw what is happening

you can follow the links I gave you. You used c:\cygwin64 as root directory, therefore c:\cygwin will not work in your environment.
You need to remove the misconfigured service first by: cygrunsrv -R SERVICE_NAME

cron-config

The cron daemon can run as a service or as a job. The latter is not recommended.
Cron is already installed as a service under account LocalSystem.
Do you want to remove or reinstall it? (yes/no) no
Error: cannot find cygwin username for account LocalSystem
Remove the service and reinstall it.

net start cron

The requested service has already been started.

More help is available by typing NET HELPMSG 2182.

Hello all,
my problem solved, thank you all for the support...

Actually, location of the script file should be C:\cygwin64\home\Username\scripts\backup.sh instead of C:\cygwin64\bin\backup.sh

and in crontab : */1 * * * * sh /cygdrive/c/cygwin64/home/Username/scripts/backup.sh
so that rsync command is executed every 1 minute...

once again, thanks...

BTW - you don't need the "*/1" if you want it to execute every minute, just use "*".

The first time the script runs it has to backup everything.
Depending on how much this is, it could take longer than a minute...

Subsequent runs ought to be very much faster.

yeah.. i got it.. i can write "*" instead of "*/1" for 1 minute
ya.. right, its depend on the size of data..
thank u very much