VMS Help  —  BACKUP  Qualifiers  /GROUP_SIZE
       /GROUP_SIZE=n

    Defines the number of blocks BACKUP places in each redundancy
    group. The value of n must be 0 to 100.

    If you define a value of 0 for /GROUP_SIZE, no redundancy groups
    are created for the save set. /GROUP_SIZE=10 is the default
    value.
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