While I've personally had no luck with the archiving programs out there, I finally was able to successfully download the backup from Yahoo Groups itself of the groups I belong to. Not sure how much information it provides, but it includes groups I'm a member of, not just my own mailing lists. Would be happy to make the information available for any lists that don't have an issue with the information being made public.
Archiving Yahoo Groups
https://lmemsm.dreamwidth.org/11107.html
While I've personally had no luck with the archiving programs out there, I finally was able to successfully download the backup from Yahoo Groups itself of the groups I belong to. Not sure how much information it provides, but it includes groups I'm a member of, not just my own mailing lists. Would be happy to make the information available for any lists that don't have an issue with the information being made public.