collaborative backup system?

[gusl]

Does there exist some kind of collaborative backup system?

Your HD could be partnered with a few other Internetted computers (or to be more efficient, use a checksum system like RAID) to make backups of each other (or just the most important directories). There could be a daily update of the changes made.

I think most people would want some sort of encryption, so that users of the remote computers else can't read their data.

Comments

[jbouwens.livejournal.com]

There's Freenet (http://freenet.sourceforge.net/). It's pretty much what you describe, except that it isn't actually designed as a backup system, but as a truly anonymous replacement for the WWW. Everything you post on Freenet is potentially accessible to anyone though, which may not be what you want.

Google came back with some other options too: Unison (http://www.cis.upenn.edu/~bcpierce/unison/index.html), MMB (http://www.pensamos.com/mmb/) and Grouper (http://www.grouper.com/about/what.aspx).