I have an old i5 Mac mini (2011 I think) as a backup for infrastructure stuff (proxy, home assistant, pihole). If something goes terribly wrong I can just plug it in and start it. All the LXCs are copies of my main proxmox rig, albeit a bit outdated (BC I don’t leave it plugged in). I know I could do better with proxmox’s HA but seems like another thing I’d be on the hook to keep maintaining.