If you were just doing it for yourself then some cheap external SSDs for off-site rotation could be made to work. But that gets increasingly fragile if you're supporting multiple people.
I guess that one of the clouds is the best bet, as you originally said. I can't really advise on that choice 👍

Dumb question perhaps but roughly how much storage are you after? External storage devices are cheap and a little discipline could get you going with off site copies.
If this is too naive then apologies.

But worthwhile, I feel 🫶

Yep, had a good one that broke the company's email system 😅
Some joker added a reply with a pie chart showing the split between 'unsubscribe me' messages, 'stop hitting reply all' messages etc. Of course the image took up space and made everything worse - recursively.
We got more work in the end

Brad Guigar @bradguigar.com
Jeph Jacques of Questionable Content

I don't think you ever need to apologise for that. Handling family health issues is really hard. Take a break, if you can 🫶