Is there any way that someone (e.g. a relay) could intercept my data? Or is it encrypted in transit?
If I’m using SyncThing to sync databases from my production server to my backup server & test environments, and there’s any way that a relay could read the data, I guess I’m in trouble.
The docs section about relays explains this.
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The connection between two devices is still end to end encrypted, the relay only retransmits the encrypted data much like a router. However, a device must register with a relay in order to be reachable over that relay, so the relay knows your IP and device ID. In that respect it is similar to a discovery server. The relay operator can see the amount of traffic flowing between devices.
Thanks! =)