Backup

Does anyone know of the good backup program? 
I do not want an image utility

I have a 250 GB hard drive in my main computer, and a 250 GB hard drive in my server computer along with other hard drives.  I would like the server computer to basically make copy of the file structure of my 250 gigger in my main computer and from time to time scan for changes.  If possible, I would like to be able to set how often each folder updates to check for changes as in like

check D:\Music on main computer weekly  (backup that folder weekly)
check D:\Photo on main computer daily and backup daily, etc.

There's a neat backup hack involving hard-links and rsync:

mv /Backup/System.02 /Backup/System.03
mv /Backup/System.01 /Backup/System.02 #  ...and so on
pax -r -w -l -p e . /Backup/System.01 # duplicate the whole tree, but using hardlinks
cd /
rsync -aOHS --delete --delete-excluded --filter="- /Backup" / /Backup/System

The way that hardlinks and rsync work allows you to keep snapshots of the whole system numerous times over while using little extra diskspace.