I'm running Ubuntu 8.04.2 and Zimbra 5.0.16(both 64bit). I have configured Zimbra to be Domain Controller as well, things are going well now. But when I put 0 0 * * * /root/backup.sh -confirm this command into my crontab by using crontab -e by root user. After that I looked at my log backup file. It's only start my command until it noticed "stop zimbra successfull" and didn't make any backup files. It means some command after that couldn't start .I did this very very successfull while I was running on CentOS with Zimbra. But I prefer to use Ubuntu. Please trying to help me how to solve this problem. Anyway if I run my backup.sh directly by using "./root/backup.sh" on Ubuntu , it backed up successful.