What I did is install proxmox on the bare metal, setup a vm in which I put the containers.

Proxmox itself stays (almost) completely stock. The only changes I've made to it were to add the NUT client package so it could gracefully shut down if my NUT server indicates that the UPS is running out of power during an outage.

In your VMs you can do whatever. Setup OMV, or a stock Ubuntu or Debian vm and install your services on the VM or use Docker/Podman. Setup Fedora CoreOS or IoT vms and host all your services in Podman containers.

The great thing about Proxmox is you can do snapshot backups which take mere moments to complete. Then pass those off to a NAS where they can survive a irreparable loss of your Proxmox server.

You can also spin up new vms as needed to just try to fuck around with new techs or just a new way of setting up your home lab. It gives you a ton of flexibility and makes backing stuff up way easier.

Another great thing you can do is if 3 years down the line you are looking to replace your server hardware with some newer or more powerful stuff you can just add the new device as a node to the cluster. Then you can migrate all your existing VMs over to your new hardware and decommission your old one with very little to no downtime on anything.