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I put up on Launchpad a backup utility I wrote called Chipmunk Backup. It's not extremely configurable nor does it have a huge set of features. It's a simple tool for maintaining a number of GnuPG encrypted full backups of a directory in a remote, rsync-accessible location.

There's no ready to download archive, but checking out lp:chipmunk-backup with bzr should give you a working version.

It's written in PLT Scheme and is known to work with version 4.1.4.