There is no shortage of backup software in GNU/Linux. From full clones of hard drives to browser bookmarks there's something for everyone. However, sometimes you just need to be more selective about what you backup.
If you want to backup your precious desktop settings, you should try Ubuntu Tweak: it is bundled with a host of really useful features, it's been around for a while and it's up to version seven. You might find a version in your distro's repositories but if you're out of luck, download it from the official site.