VMS Help BACKUP Command, Qualifiers, /CONVERT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Input File-Selection Qualifier

    Converts ODS-5 file names to ODS-2 file names. To preserve the
    output volume as ODS-2, you must also use the /NOINIT qualifier.

    Be aware that all ODS-5 file attributes are lost if you convert
    from ODS-5 files to an ODS-2 volume.