Oh, and the syncthing encryption that you may enable for the folders is for these devices/ clients. This may be useful is you were to use a third part machine, like a VPS, as a 24/ 7 node for your files. That's different from a relay, may be desirable if you want to sync ASAP and avoid conflicts. In any case, conflicts are rare.. you would need to open the DB and add entries at the same time, or some quirky scenario...