Library /sys$common/syshlp/helplib.hlb  —  DELETE  file  Qualifiers  /BACKUP
    Modifies the time value specified with the /BEFORE or the
    /SINCE qualifier. The /BACKUP qualifier selects files according
    to the dates of their most recent backups. This qualifier
    is incompatible with the /CREATED, /EXPIRED, and /MODIFIED
    qualifiers, which also allow you to select files according
    to time attributes. If you specify none of these four time
    qualifiers, the default is the /CREATED qualifier.

                                   NOTE

       Using this qualifier with DELETE/TREE command results in an
       error.
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