After having recently restored some stuff from an aging external hdd, i’m seriously considering getting a few dvdr discs and burning the important things every now and then.
I know they don’t last forever either, but - just as a random example that has definitely never happened to me hahaha - you can drop them from a height of 3 feet and still get files off them!
Without knowing how serious your relationship is, it’s hard to say.
I would advise not doing this if the main reason is to save money, especially with one person being the sole owner. The power dynamic is too unbalanced.
But if you’re both pretty sure this is a long-term, perhaps lifelong, relationship, then no one here can give you the correct answer. Set aside some time, sit down with your partner, discuss things from both a practical and emotional perspective, do this again in another week or two, and find an arrangement you both feel good about.