This article is idiotic: Cloud synchronisation is not backup. If you think that, you are a wally, despite the vendor's promises.

This is a new feature they have added that allows sync between devices. It doesn't stop any of the old ways of doing stuff from working other than windows backup which was a piece of shit that didn't work properly anyway.

Sync is always notoriously problematic at the best of times so YMMV always with that approach.

Realistically, most people just drag stuff to a USB stick periodically and that's good enough for backup. That's how it really works.