I’ve always found that the default hacker advice is was a bit too complex for my taste. If I’m someone who hardly cares about archiving things - I’m not suddenly going to care about setting up a NAS/Ceph/Backblaze/S3.

The lowest friction tool for me for nearly a decade now has just been iCloud. It helps that I use Apple products everywhere (and I even have iCloud installed on my windows machine), but I just default to storing things in iCloud.

Searching is not the best but I’m confident the files are there

You can just plug in a USB3 SSD. The key is to have something easily transferred between machines as they are replaced. Then you just need discipline to keep everything important on that storage.