local partition backup with rsync

[Hugo Vanwoerkom <hvw59601@care2.com>]

Hi,

I would like to do a local partition backup with rsync.

It works right with a partition that contains /home:


rsync -av --delete /hda10 /sdb7


But it does not work right with the partition that I boot into:


rsync -av --delete --exclude /home --exclude /usr/local --exclude /hda10 
 / /hdb5


He does it the first time, but the second time, which is supposed to be 
just an update, he copies all files again and runs out of room.

Anybody uses rsync to backup the partition that they boot into?

Hugo