Restore to a zfs/thin provision from a .qcow2 file?

I have a .qcow2 file of a VM that I used to have in a 'directory' storage system. I have a backup of this VM from a week ago that I used to "restore" the VM with and then restored it to a new location in my datacenter storage that I made ZFS (with thin provision checked when I made that storage).

This all works, but there is a week of no backups that would be nice to have. I already re-installed proxmox. I guess I could (I think?) make a regular directory storage and load the qcow2 file...

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