I have released version 0.16 of Obnam, my backup application. It adds encryption support. My personal Debian repository has binaries for squeeze in i386, amd64, and armel architectures.
More importantly, this is the first BETA release. Obnam should now be feature complete for real use. Performance is lacking and there are many bugs remaining. There are no known bugs that would corrupt backed up data, or prevent its recovery.
I've made a roadmap for 1.0, which later on everyone will get a great big laugh about.