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SET, FILE, Qualifiers, /BACKUP
 *Conan The Librarian 

       /BACKUP
       /NOBACKUP

    Specifies that the Backup utility (BACKUP) records the contents
    of the file. The /NOBACKUP qualifier causes BACKUP to record the
    attributes of the file but not its contents. This qualifier is
    valid only for Files-11 Structure On-Disk Level 2 and 5 files.

    The /NOBACKUP qualifier is useful for saving files that contain
    unimportant data, such as SWAPFILES.
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