I have just started to make a new backup utility. At the moment it only creates a sha manifest of files (including the exclusion rules) and states which files were changed since the last version of the sha manifest. That can and will be used to create incremental backups which are easily readable by anyone (files will be stored the same way they were on the disk). That could be very useful for backing up music or something like that. You don't want your music to be in some unreadable format on the CD/DVD :) And using this fbackup the only thing you would have except your music is a small xml file containing the SHAs of the music files and their disk locations.
The repository can be found here. You can clone the repository like this:
hg clone http://tesla.rcub.bg.ac.yu/~brcha/hg/FBackup.hg