/BY_OWNER[=[uic]]
       /BY_OWNER[=option]

    As an input file-selection qualifier, /BY_OWNER causes BACKUP
    to process files owned by the specified UIC. Specify the UIC as
    octal numbers or in alphanumeric format (in the form [g,m]). Note
    that the UIC specification must include the brackets. UIC formats
    are described in the OpenVMS User's Manual. If you specify this
    qualifier without a UIC, the default UIC is the current process
    UIC. If you do not specify this qualifier, BACKUP processes all
    files on the volume.

    As an output file qualifier, /BY_OWNER redefines the owner UIC
    for each file restored during the operation. As an output save-
    set qualifier, /BY_OWNER specifies the owner UIC of the save set.
    If you omit the /BY_OWNER qualifier, the save set receives the
    UIC of the current process. To use /BY_OWNER as an output save-
    set qualifier, you must have the SYSPRV user privilege or the UIC
    must be your own.