1. In my case, VM image SSDs are formatted using LVM-Thin. Based on this, Proxmox automatically takes care of snapshotting the VM images for backups. It would w

1. In my case, VM image SSDs are formatted using LVM-Thin. Based on this, Proxmox automatically takes care of snapshotting the VM images for backups. It would work the same if you used ZFS for image storage. 2. No, I do not currently backup the Proxmox config. There is a good script here: https://github.com/DerDanilo/proxmox-stuff https://github.com/DerDanilo/proxmox-stuff 3. If you install Proxmox on a "thin" filesystem (ZFS or LVM-Thin), then yes, you will get snapshot functionality for free. Note that you would have to configure this yourself - Proxmox does not expose a backup feature for its own config. 4. I have two NVMe SSDs. The first is 500GB and is split into two partitions: 100GB for the Proxmox install (LVM + ext4), and 400GB for VM images and containers (LVM-Thin). The second is 900GB and is fully used for VM images. Both are using LVM.