I'm not even that far on the anti-DRM side, but a forced Steam update adding DRM to a game you've already bought is ridiculous. I think with GoG and Epic you can turn off auto-updates.
It seems like you wouldn't get a great value playing super long (and cheap to buy) RPGs on a subscription service. Wouldn't you want to play through as many games as possible?
This is a deliberately cumbersome and worse solution. It's an all or none sort of backup. When you restore the backup it wipes out every PS5 game save on the console and replaces it with the backup. Contrast that to the PS4 saves where you can pick and choose which save you backup and restore...
You can get them at Dollar General (if still available) for 20% off right now. They're in the 3x$10 multipacks, so it would work perfectly for what you're wanting.
I figure the subscription cards are going to dry up. Sony doesn't even sell them anymore, do they? It's all dollar amount cards, since those are harder to discount.