Sure. The hardware is a cheap little beelink with an n100 and 16gb of RAM. Proxmox can do VMs, but is primarily focused on LXCs, which are Linux containers. They share the kernel with the host, so they're very lightweight — you can spin up basically as many (say) Debian systems as you want. So I have Jellyfin on one container, Sonarr/Radarr on another (though you could put them on separate containers if you wanted), transmission has a container, sabnzb has a co- ... you get the idea lol.
The cool thing is that it's easy to mount drives/directories from the host, and have your containers share them that way.
Wrt backups, Proxmox had some built in functionality you can run from the web ui. So I back up images of the LXCs to the external hard drive daily, then have a borg container that backs up the back up directory to cloud storage.
It's also very convenient to make a quick backup before making any changes to a container — you can restore to a previous image with the click of a button.
"I am bad at public relations, please pay me to represent your business to the public"