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For a Case 2 driver (design/block-data-mover/block-data-mover.md), such as Ceph RBD, rbd snap diff needs the base and target snapshots in the same clone chain. Delete destroys the base as soon as the backup completes, so the next incremental's delta query fails and degrades to an allocated-blocks backup (or a full whole-device transfer without that fix). Inheriting Retain there isn't an optional nicety, it's what makes incrementals possible at all. Signed-off-by: Tiger Kaovilai <tkaovila@redhat.com>