Simple Backup Suite
You've missed one of the best -- Simple Backup Suite (sbackup). Especially good for backing up your personal machine to a USB hard disk (although it does work with network storage as well).
It's written and tuned for Linux, so the restoration works differently than a disk-image backup for Windows. Rather than restore a disk image (which can be problematic if you've just replaced a failed hard disk) you reinstall Linux and then use SBackup to restore your settings and files. Not copying acres of operating system files which are the same on every machine makes for much faster backups. SBackup does save your package database, so you do know what to reinstall.
Available for Ubuntu, although of course having a competing product Canonical don't promote it (which pretty much summarises the qualms the Linux community has about Canonical).
If you like rsync but dislike the command line then you might take a shine to Lucky Backup.