sepmdd daemon obtains following tokens from seos.ini file to take backup of pmd_audit file because those tokens are not existed in pmd.ini file as initial state.
It means the backup of pmd_audit file is taken as same way as the backup of seos.audit file.
If you want to change the value of those tokens only effective for the backup of pmd_audit file, then you can simply add those tokens in pmd.ini file.
After adding those tokens, you need to restart sepmdd daemon.
Then, sepmdd daemon obtains those tokens from pmd.ini file and takes backup of pmd_audit file in accordace with the specified values in those tokens.