I would advise against syncthing as a backup solution. Without past snapshots, it won’t prevent you from losing all data once you sync deletions.
Borg-Backup or appropriately setup rsync, or arq, or restic are better solutions for backup.
My borg has continuous monthly snapshots from ever since I started using it, many years ago. Despite changing operating systems and file systems and computers and everything several times in the meantime. I can highly recommend it.
(syncthing is great for file synchronization, though)
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