Clonezilla

For users looking for an easy-to-use graphical Clonezilla interface, I have carefully developed Rescuezilla to be a graphical fully interoperable replacement to Clonezilla. Of course, Clonezilla has many more configuration options to tweak (especially in "Expert Mode"), but Rescuezilla is able to restore these backup images -- and backup images created by Rescuezilla can be restored using Clonezilla -- so I think it's a good alternative for even advanced Clonezilla users. Rescuezilla is of course free and open-source (licensed under the GPLv3). It's fork of Redo Backup and Recovery (now called Redo Rescue) after that application had been abandoned for 7 years.

I should mention that since your post in June 2011, browsing Clonezilla backup images has become possible, but it's still pretty difficult for most users. Once some other priorities have been completed, I will make an easy-to-use application to mount Clonezilla images and restore/extract individual files: https://github.com/rescuezilla/rescuezilla/issues/20 This will be available as a graphical tool and as a command-line interface, including standalone packages that can be installed on arbitrary Linux distributions. :)

Unfortunately just like Clonezilla, Rescuezilla does not yet have differential/incremental backup. This feature will not be added any time soon: unilaterally adding this feature would prevent Rescuezilla backups from being able to be restored with Clonezilla, which would not be cool.