I ran into this problem on a clients synology that had a faulty factory reset button. It reset itself, so DSM had to be reinstalled. It automatically installed DSM 7. Ok, fine. Then I go to reinstall Nakivo and find out it isn't compatible. Spent about 5hrs moving Nakivo to the server and recreating the backups. This was a month ago on Aug 25. Sure would be nice to get this fixed.