I have a Proxmox host machine with one large Centos KVM image running. The proxmox host has two drives in a ZFS raid1 like array. It has a single second drive used for backups. I want to backup this image and move it too new machine as fast as possible. This is the only KVM running on this server. I want to shut it down completely when doing the backup. Is there any tweaks to speed up the backup process? I do not care if I increase the system load on the proxmox host since it is only running this single KVM that will be shutdown during the backup process.