Comment by port11
Okay, secure E2EE backups we've more or less perfected for a while. There's good F/LOSS solutions for that. And if you're willing to pay a bit, thinks like Backblaze come to mind. In other areas it's true that open-source stuff is less polished, but not backups. I mean, a few months back Apple had a regression where they were un-deleting people's photos, that's pretty nasty.
You haven't actually listed one yet. I can't think of one myself that Grandma could use safely.