Alternative way to install Hassio
After my initial setup I found out there are possible to install Hassio directly as VM on proxmox using hassos! My strategy is to make local add-ons for any docker container I need for Home Assistant. In that way I can keep the server footprint very small and have "all-in-one" package to backup both hassio config plus VM.
See whisker hassos install script for instructions. This script apply for proxmox.
Warning!
If you use several hassio instances on the same machine, disable discovery for yeelight on all but one. There are a bug that makes hass loop 100% cpu.