One of the problems with doing backups is the poor clarity on how to manage the process in the most effective way. For example, i have a synology NAS and there are do many different apps for backing up, so many different methods and a lack of clarity which app is best suited for backing up the PC, which for backing up the NAS itself, and which app plays archive server to other NAS. Etc. And there are alternative apps, and now the new „synology drive“ app, and it is unclear which is better for what situations and which ones will have a longer maintenance future.
Add to that, that you hear if failed backups or incompatibility or lost files on NAS mirroring, and you end up in a situation where implementing mught be more risky than the risk of HDD failure itself.
So i RAID mirror a dedicated fileserver. Over the last ten years i have list teo drives, but rebuilt and lost no data
(Finger typed while queuing, will update later)