Volume backup is necessary to guard against losing a volume, but it need not be done often if you are doing incremental backup on a regular basis. If you lose a volume, you can recover from the latest volume backup, and then recover data sets from incremental backups to return the volume to its status before the failure. This form of recovery is sometimes referred to as forward recovery. To perform it, however, you must have a record of all of your backups. The DFSMShsm component keeps its own inventory of the data sets it backs up and can perform forward recovery using that inventory. DFSMSdss prints the names of the data sets it dumps and the serial number and data set sequence number of the tape volumes on which the dump begins and ends. You must use this printed record to perform forward recovery with DFSMSdss.