On top of it? Yes, that would be great!!! Idea? On top of the BT Sync API with another client, not just for folder/key pairs and monitoring folders (new and changed files), but also: - Keeping older versions. - Keeping deleted files. - Going back to a 'snaphot' a month ago, a year ago etc. As for the 'community' part: It would require a system to automaticaly detect the storage I need and the storage I host for others. If I needed a backup for 5 GB, with a 4 times replication, I could offer 20 GB myself. And on top of that: reporting about the 'health' status for my backups. When 4 strangers (hosting my backup) go down at the same time, I can't recover something. etc. Something like this would be neat I think. A more generic approach (not operational though) is The Ethereum project. https://www.ethereum.org/ I uses blockchain technology to exchange value. In this context the value would be 'storage'. Same as http://storj.io/ you already mentioned.