My backup concept is on the to-do list. Been there for a couple years. I do have triple pihole/caddy/haproxy/redis for high availability on a triple node proxmox cluster! necessary? no. cool, though? heck yeah! friends and family impressed? uhm... what was the question?
I know about pbs, I even have an IP set aside for it :) I do have the built-in proxmox backup function take nightly snapshots or my important vms to my nas, but I don't have anything really put together. Also, nothing for my nas itself. It is configured in a raid 5, but as we all know, raid is not backup :)
One day, after I am done with [insert reason here], I will have a bad ass, well thought out backup solution.