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.

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This suggestion is not intended to be an endosement of child porn, or any other illegal or even immoral materials which could potentially obstruct any future attempts to obtain a secret clearance.