BluRay disks. Every year I make a backup of the really important stuff (documents, family pictures), burn two disks and give each of them to a different family member.

I use Backblaze B2. I used to use Restic to do the backing up, but now I use Duplicati. I don’t back everything up, just photos, music, documents and stuff, a couple of important VM images, and that’s about it.

A 1TB USB stick on my keychain.

No backups is always cheap and easy