Everything backs up to a Synology diskstation (with disk redundancy). The Syno’s Hyperbackup makes backups of critical stuff stuff to the cloud weekly. In the case of my self-hosted stuff, it’s mostly the share storage where all my docker volumes map to. Also workstation backsups, home assistant backups, phone photos, etc.

A back up of the temporally replaceable stuff (everything not covered above) which is hosted from the Diskstation, is made to an external drive a few times a year and stored off-site the rest of the time. This isn’t 3-2-1, but its close enough for my needs.