I have the equivalent of RAID 5 too, but mind the usual “RAID is not a backup” - if you deliberately delete something (or something goes wrong with an app managing your media), hardware redundancy won’t save you in any way; it only helps if the data is intact and you want to remedy a hardware failure.
I only back up my music collection because I put extra effort into organising and tagging everything, plus some of it is rips of CDs not available anywhere. As for movies and TV shows, I only back up configurations and catalogues of the relevant apps, the contents themselves are 1) too big to be feasible to back up and 2) 99% of the time available to re-download.
Same.