Library /sys$common/syshlp/DFUHLP.HLB
DFU, SET, Qualifiers, /BACKUP_DATE
 *Conan The Librarian 

  /BACKUP_DATE=date
  /NOBACKUP_DATE

   Controls whether a new  backup date is  assigned  to  the  specified
   files.  Specify the date according to the rules described in Chapter
   1 of the VMS  DCL  Concepts  Manual.   Absolute  date  keywords  are
   allowed. Use of this qualifier requires ownership of the file or
   access control.
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