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by keeperofdakeys 1728 days ago
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/

Also you can always do the fsfreeze yourself (which is what qemu agent can do, and is used by proxmox backup server).