Watch out to enable "keep on delete" features. I didn't do that and didn't see that gigabytes of personal photos got deleted which I had to recover from an old backup. Still don't know how it happened as I only found out a few weeks after the fact.
Sync is not backup! If there's a software bug or a wrong setting sync can delete your files. Syncthing is pretty mature so I doubt this was a Syncthing bug, however you shouldn't only trust Syncthing. I'm doing btrfs snapshots weekly and delete them after three years for important folders nowadays.
Watch out to enable "keep on delete" features. I didn't do that and didn't see that gigabytes of personal photos got deleted which I had to recover from an old backup. Still don't know how it happened as I only found out a few weeks after the fact.
Sync is not backup! If there's a software bug or a wrong setting sync can delete your files. Syncthing is pretty mature so I doubt this was a Syncthing bug, however you shouldn't only trust Syncthing. I'm doing btrfs snapshots weekly and delete them after three years for important folders nowadays.