Server :: Cronjob Rsync Doesn't Work

I have a computer that I would like to backup the home directory onto a server. I created a script called wien_backup.sh that contains the following:

#!/bin/bash -l
/usr/bin/rsync -rv --delete-after --ignore-errors -e /usr/bin/ssh root@wngr403-unix2:/home/ /space/systemimager/Wien/

where wngr403-unix2 is the computer I am backing up, and the script is ran from the server. If I run the script by itself, it works just fine. If I run it as a cronjob, the /var/log/syslog says it ran, but it does nothing.