Use ZFS snapshots in lieu of --quiesce

Amazing tool, thank you!

I'm in the processing of designing my system and seeking to minimize the attack surface in the guest by not installing the QEMU Guest Agent. Do you think it's reasonable to use ZFS in my guest and create hourly snapshots via Sanoid in lieu of quiescing the file system? In theory even if ZFS and qmpbackup aren't synchronized I should be able to retrieve a crash-consistent snapshot from within an hour of when a qmpbackup backup was made.