Backup Ubuntu server 12.05 LT

I wonder what free backup utilities fellow admins are using to clone or backup root disks of ubuntu servers. I try clonezilla, but errors pop up.
Any ideas?

---------- Post updated at 02:51 PM ---------- Previous update was at 09:49 AM ----------

I have used the rsync command like:

rsync -azvr --progress  --exclude /archives --exclude /data1 --exclude /backup --exclude /data2 --exclude /testdb --exclude /netappbk --exclude /mcelnetapp -- exclude /dev root@10.100.48.75:/flash/mkesh/server4/

but an error pop up:

/usr/bin/rsync -azvr --progress  --exclude /archives --exclude /data1 --exclude /backup --exclude /data2 --exclude /testdb --exclude /netappbk --exclude /mcelnetapp -- exclude /dev root@10.100.48.75:/flash/mkesh/server4/
Password:
sh: rsync: not found
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: error in rsync protocol data stream (code 12) at io.c(605) [sender=3.0.9]