Syncthing is just open source Dropbox, self hosted. It's entire purpose is "make two folders identical". It's very good at that: so good that I frequently wis

Syncthing is just open source Dropbox, self hosted. It's entire purpose is "make two folders identical". It's very good at that: so good that I frequently wish it did other things - i.e. if it had some notion of minimum seeding levels so it would destage files off a device provided they were replicated elsewhere (e.g. automatically clearing old photos off your phone would be a good use of it).