Critical volumes in the disaster recovery data are shown when selecting assets to be backed up. The following volumes are in the disaster recovery data:

• Any volume that contains operating-system files.
• Any volume that contains a third-party service.
• Any non-critical volume that has a critical volume mounted on it, or any non-critical volume that serves as a parent to a critical volume. In either case, both the parent volume and mounted volume are treated as critical.
• If any volumes on a dynamic disk are critical, all volumes on the dynamic disk are considered critical. This is a Microsoft requirement.