BACKING UP                                               RESTORING
 
                        +-----------------------+
(1) RT-11 FILES   ----> |                       | ---->  (3) FILES
                        |                       |
                        |        SAVESET        | ---->  (4) DEVICE
                        |                       |
(2) RT-11 DEVICE  ----> |                       | ---->  (5) ONE LOGICAL-DISK FILE
                        +-----------------------+           
 

                        +-----------------------+
                        |                       |                 
                        |   LOGICAL-DISK FILE   | 
(6) RT-11 FILES   ----> |       (SUBSET)        | ---->  (7) FILES 
                        |                       |
                        |                       |                               
                        +-----------------------+