So a bit of additional 'lore' which is
probably obvious to a zillion VMS
 admins but was news to me. One can create a standalone backup tape that is
 both bootable into standalone backup, and has the system image on it. I did
 it as follows:
        1) INIT the tape with label SYSTEM
        2) @SYS$SYSTEM:STABACKIT
                Select MUA0 as the device
                Tell it _not_ to re-initialize.
        3) Now boot this tape and at the prompt use
                BACKUP/IMAGE/VERIFY DUA0: MUA0:MYBACKUP.B/SAVE/LABEL=SYSTEM
        Now go away for a while :-)
 Once its done you can boot the tape and restore with
        BACKUP/IMAGE/VERIFY MUA0:MYBACKUP.B/SAVE/LABEL=SYSTEM DUA0:
 This saves me from having to change tapes in the process. 
Yes, this is fairly common.  I also like to keep a SA BACKUP set
on a couple of my non-system drives.
--
Eric Dittman
dittman(a)dittman.net