Another backup option is Carbon Copy Clone, a donation ware program for Mac OSX 10.6.x.
To use this program to backup to a network drive, you have to create a mountable device on the network share. The best way to do this is to create a sparsebundle device (described in the previous post) and then attach it to your system as a device.
So, assuming that you've made the sparsebundle and copied it to you SMB share, you mount the share (this assumes an SMB share):
mount -t smbfs //user@server/sharename ~/share
This assumes you've created a directory called share in your home directory.
And then attach the sparsebundle:
sudo hdiutil attach /Volumes/Erador/ccc.sparsebundle
Now its a device you can select.