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drive-backup and blockdev-backup have an awful lot of things in common that are the same. Let's fix that. I don't deduplicate 'target', because the semantics actually did change between each structure. Leave that one alone so it can be documented separately. Where documentation was not identical, use the most up-to-date version. For "speed", use Blockdev-Backup's version. For "sync", use Drive-Backup's version. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> [Maintainer edit: modified commit message. --js] Reviewed-by: Markus Armbruster <armbru@redhat.com> Message-id: 20190709232550.10724-2-jsnow@redhat.com Signed-off-by: John Snow <jsnow@redhat.com>