I'm a fan of the "low tech" redundant backup, that is making an independent copy of the data for example once a year on a new hdd and put that in your parents a

I'm a fan of the "low tech" redundant backup, that is making an independent copy of the data for example once a year on a new hdd and put that in your parents attic. It's not exactly matching OP's requirements, but my solution is to regularly rsync important stuff to a small home server, on that homeserver do a borg-backup of the backup folder once a week onto a second drive. First one is ssd, second spinning rust. In ops case I think the biggest problem is sifting through all the data. I did this a few years ago with only 4 or 5 old drives and a dozen dvds and it was exhausting, but also occasionally pretty nostalgic when I found photos from college or old programs I wrote as a teen.