I am currenty evaluating “Syncthing” – the first open source implementation of the a decentralized file-sync system. Imaging it like Dropbox or BitTorrent Sync. This thing is an open source project, so you can peer into the source-code and compile it yourself. Since file-syncing is a part of the internet-infrstructure, I think it is really important to have this one open source!
The first test of Syncthing was successful and I can encourage everyone to try this out and have an eye at this project.