VMS Help  —  BACKUP  Qualifiers  /CRC
       /CRC (default)
       /NOCRC

    As an input save-set qualifier, /CRC causes the software cyclic
    redundancy check (CRC) encoded in the save set's data blocks
    to be checked (/CRC) or ignored (/NOCRC). If you ignore the CRC
    encoding, you reduce processing time at the risk of increasing
    data error.

    As an output save-set qualifier, /CRC specifies that software
    CRC checking code is to be computed and stored in the data blocks
    of the output save set. To disable CRC checking, use the /NOCRC
    qualifier.
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