We are exactly in the center of a bunch of changing technologies. First would I would not spend $48/month for backup.
I was in IT most of my career. So, at home I have a main computer with 14TB, but have moved to an all Apple architecture, so I have an 8TB solid state drive attached to my MAC... two 48TB network attached storage. A cloud account with Microsoft which I keep my working data files, a couple tb.
Anyway, for long term storage solid state drives are not stable. So for archiving use real disc drives. I would back your stuff up to a couple attachable drives. You can get 8tb drives for a song and a dance. Then put them on the shelf.
Get a subscription to Qobuz for $12 / month and you will have access virtually every album you own and a million more. There just isn’t a reason to own files any more. Streaming sounds just as good as stored files. I have 2,000 stored albums and 2,000 vinyl albums which I don’t use any more because streaming sounds as good or often better as they are higher resolution.
Time to move on from owning music files. It’s a lot of hassle and not worth the time or effort. Mostly I keep all the storage for duplicate backups of my 130,000 high resolution photos. Redundancy is the key to keeping data. But cloud storage of data is the way to go for your own stuff... I have 100gb One Note database with everything from hundreds of papers on Astronomy, Geology... etc to my car titles and manuals for everything I bought and wrote about in the last twenty years. But that is just working data. I keep backups of them... well, I just don't trust anyone. I have run big data centers and accidents happen.