Hi, forwarding Sofia's response from a recent thread [1]. Check out this explanation [2]. [1] https://lists.openstack.org/pipermail/openstack-discuss/2023-May/033818.html [1] https://web.archive.org/web/20160404120859/http://gorka.eguileor.com/inside-... Zitat von garcetto <garcetto@gmail.com>:

good morning, i was trying cinder-backup to backup cinder volumes from nfs backend and ceph rbd backend. both my test show that i can do incremental cinder-backup, but i dont get how technically the cinder-backup could "understand" the new incremental blocks from previous backup? maybe on ceph it leverages ceph-diff? but on nfs backend, how it knows changed blocks?

thank you