Backing up your data on a regular basis is important, and turning a spare computer into a backup server is often the best way to make sure it gets done.
I have already mentioned numerous backup concepts and programs here. We use Crashplan at Paessler AG for offsite Backups.
Now here is yet another approach: With “Restore”, a free, open-source backup system that can install or run from a live CD, work with any OS, and operate through a simple browser-based interface.
Read more on the Lifehacker webpage: Create Your Own Cross-Platform Backup Server