I take daily snapshots of my Proxmox VMs and put them onto the NAS via NFS. Most of the other stuff gets copied into the NAS more or less automatically (=often forgotten) but most important things are now part of my selfhosted tools so it’s not too bad.

I still need to have a third place, off-site, but I’m not sure yet how I’ll do it. My drives are encrypted and I would want to have it the same way for the off-site station. I’m imagining something like a small box at my mom’s place that turns itself on weekly and pulls from my NAS, since she doesn’t have a public IP. I’d still need some kind of maintenance possibility but I haven’t thought this through yet.