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Concerns Raised Over Bitwarden Moving Further Away From Open-Source
(www.phoronix.com)
This is a most excellent place for technology news and articles.
Syncthing is encrypted transfers.
The database is encrypted.
And you can set it to not use relays for data, only matchmaking between your own devices.
So it's an encrypted file, encrypted again, and sent directly from an IP you own to an IP you own.