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Depends on your use case. You can configure it to keep versions of files: https://docs.syncthing.net/users/versioning.html

(But Syncthing is intended for file syncing, not backup.)

Backing up your filesystem can and really should be part of an entirely different process. Let syncthing focus on syncing. Get CrashPlan, rsync, or some other process going on your filesystem for backups. Unless you are hoping for backing up every single version of your documents.

check out borg backup, it's my favorite backup tool

https://www.stavros.io/posts/holy-grail-backups/