Syncthing now supports untrusted device sync[0] (i.e. storing an encrypted copy on an untrusted device) in a recent version, though this is still on beta. [0]:

Syncthing now supports untrusted device sync[0] (i.e. storing an encrypted copy on an untrusted device) in a recent version, though this is still on beta. [0]: https://docs.syncthing.net/users/untrusted.html https://docs.syncthing.net/users/untrusted.html