Backing up .qcow2 VMs on #proxmox works fine but it takes space when doing the snapshot as it makes a full temporary copy of the disk. it’s ok for my usage and I like that I deal with disk image simple files.

Now that I have two working PBS instances and tested how quickly I can restore backuped VMs from the PBS DataStore onto any Proxmox host I may experiment with moving my VMs on LVM-Thin or ZFS - on a secondary external SSDs to avoid mishaps.