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Syncthing 2.0 Launches With Major Database Overhaul
(linuxiac.com)
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Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Doens't look like Syncthing-Fork is on 2.0 yet. They have an RC but if you use it, you might want to be careful upgrading before they release.
Is 2.0 backward compatible with 1.x?
Protocol-wise? I don't know. But usually major version bumps indicate some kind of breaking change.