A file specification for the backup file produced by a previous
    RMU Backup command. Note that you cannot perform a remote restore
    operation on an .rbf file that has been backed up to tape and
    then copied to disk.

    The default file extension is .rbf.

    Depending on whether you are performing a restore operation
    from magnetic tape, disk, or multiple disks, the backup file
    specification should be specified as follows:

    o  To restore from magnetic tape:

       If you used multiple tape drives to create the backup file,
       the backup-file-spec parameter must be provided with (and only
       with) the first tape drive name. Additional tape drive names
       must be separated from the first and subsequent tape drive
       names with commas, as shown in the following example:

       $ RMU/RESTORE /REWIND $111$MUA0:PERS_FULL_NOV30.RBF,$112$MUA1:

    o  To restore from single or multiple disk files:

       If you used multiple disk files to create the backup file,
       the backup-file-spec parameter must be provided with (and only
       with) the first disk device name. Additional disk device names
       must be separated from the first and subsequent disk device
       names with commas. You must also be sure to include the Disk_
       File qualifier. For example:

       $ RMU/RESTORE/DISK_FILE DISK1:[DIR1]MFP.RBF,DISK2:[DIR2],DISK3:[DIR3]

       As an alternative to listing the disk device names on the
       command line (which, if you use several devices, can exceed
       the line-limit length for a command line), you can specify an
       options file in place of the backup-file-spec. For example:

       $ RMU/RESTORE/DISK_FILE "@DEVICES.OPT"

       The contents of devices.opt might appear as follows:

       DISK1:[DIR1]MFP.RBF
       DISK2:[DIR2]
       DISK3:[DIR3]

       The backup files referenced from such an options file are:

       DISK1:[DIR1]MFP.RBF
       DISK2:[DIR2]MFP01.RBF
       DISK3:[DIR3]MFP02.RBF