The website says that Syncthing is a backup program.

[martinleben]

@239

Redundancy is a trivial form of data backup.

No. It it is NOT.

https://www.raidisnotabackup.com/

(Yes, Syncthing can be seen as “RAID over network”.)

And I am not alone in claiming that Syncthing is not a backup program. In another topic, @AudriusButkevicius wrote:

@AudriusButkevicius

However, syncthing is not a backup system. It’s a system that makes two computer filesystems look the same, so by definition its not a backup system, and you’ve discovered first hand.