> BitTorrent Sync remains the most secure and private way to to move data between two or more devices.<p>That very first sentence will always be false as long as it isn't open source. (Even the protocol isn't publicly documented, last I checked.) I'm not an open-source purist, but the way they always promote as being the most secure, private option out there while completely ignoring that fact is frustrating.<p>I haven't tried using it, but Pulse[0] appears to be an open source replacement for BitTorrent Sync. I figure it's relevant to this thread.<p>[0]: <a href="https://ind.ie/pulse/" rel="nofollow">https://ind.ie/pulse/</a><p>EDIT: ef4 mentioned Syncthing in his comment. Pulse was forked from Syncthing. I think they're still compatible with each other at the moment. Nice explanation at <a href="https://discourse.syncthing.net/t/syncthing-is-still-syncthing/1372" rel="nofollow">https://discourse.syncthing.net/t/syncthing-is-still-syncthi...</a>.