I am not a db expert. However, the information you need can be found in the appropriate NMDBA Admin Guide, available from the product specific download page.
To receive the backup (NW: save set) indexes, you need to use the NW Admin GUI or the appropriate command directly.
The general syntax is as follows:
mminfo [-s nw_server] -q "query_parameter(s)" -r "report_parameter(s)" [-o sort_options] [-x delimiter_options] [> output_file]
All details and some examples can be found in the NW Command Line Reference for 'mminfo'.