Now this is somewhat clever, I have not yet tried it so I can’t say for sure how good it works but the concept is clever.
You agree with some of your friends that you will use each other as backup-hubs, install Buddy Backupand then define each other as trusted friends, then your data is backed up to your friends computers via P2P (of cause in encrypted format so your friends can’t look at your data)..
It is free and rather clever.
Read their getting started guide here
Download it here (sadly it is not available right now, a new version should be very close to release – even so close that they removed the old version – I have written to them requesting a release date but not received any yet).