With backups, my assumption is that you will never need to restore except in real "oh shit" moments- fire, electrical system zapping, etc- and if those moments happen, you are willing to pay. I have been using synology for 13 years now, and have thankfully never had to resort to using backups.

This is for home use- which maybe I was wrongly assuming that most Synology users are. In a business context you might have a more routine need to recover backups and those costs become more tangible.