I do this as well with syncthing. I have a PCengines box at home running wireguard that also runs an always on instance of syncthing so I can sync to and from

I do this as well with syncthing. I have a PCengines box at home running wireguard that also runs an always on instance of syncthing so I can sync to and from my home network from a Starbucks or wherever. It takes a little setup but once that's done it's very much "fire and forget".