Proxmox The current guest configuration does not support taking new snapshots
The current guest configuration does not support taking new snapshots https://forum.proxmox.com/threads/the-current-guest-configuration-does-not-support-taking-new-snapshots.73944/ On directory storages, you’d need qcow2 to be able to create snapshots, but for containers, using qcow2 is not possible. Have a look at this list to see on which storages PVE supports snapshots.