@felixxx I use #Incus on a Lenovo m910q mini PC that i picked up from eBay for £50.
I wrote a post on how I set it up using #NixOS a while ago. This is just a simple single node machine. I haven't looked into clusters or more advanced setups.
https://blog.hetherington.uk/2025/01/setting-up-incus-with-zfs-on-nixos/