Consistent backup:A consistent backup is one that represents a snapshot of all data at a point in time. Consistent backups are used for disaster recovery. An inconsistent backup can be useful for retrieving partial data -- for example, if a long-time customer accidentally deletes information from his profile, you can go back to an inconsistent backup and retrieve that information. It is not important that all the data be consistent with each other when retrieving a partial amount of point-in-time data.Logical backups: