The current implementation has the following limitations:
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Backups of images will always be full backups, regardless of the backup type specified for the backup.
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The Docker engine does not support simultaneous requests to download the same layer. If backups of a container or image are performed from multiple subclients at the same time, or from a single subclient using multiple streams, a backup job might fail. For more information, see https://github.com/docker/docker/pull/31136.