nova assisted incremental backup

Registered by Victor Serbu

Currently when a backup is created (even incremental backup) a full disk read is necessary except when using ceph storage.
It would be nice to determine disk changes using qcow2.
I saw that that in cinder remotefs driver exists supports to create snapshots using assist from nova, eg: https://review.opendev.org/c/openstack/cinder/+/42552
It is feasible to implement this functionality?

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