Qemu has a native changed blocks API like vmware, but I'm not sure of anything that uses it extensively (besides oroxmox backup server pointing at a oroxmox ser

Qemu has a native changed blocks API like vmware, but I'm not sure of anything that uses it extensively (besides oroxmox backup server pointing at a oroxmox server). https://lwn.net/Articles/837053/ https://lwn.net/Articles/837053/ Also you can always do the fsfreeze yourself (which is what qemu agent can do, and is used by proxmox backup server).