For a NAS, I don’t think backup tools with checksumming would be sufficient. I also am not a fan of them as the only tool to prevent bitrot. If borg detects that a backup is corrupt, my option is what? To ditch that backup? zfs can not only detect it, but also recover from it. That’s not something that most tools can do.

To be fair, I don’t know about the capabilities of gluster, ceph, and minio.