program to download archived google groups posts by author

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Barbara de Zoete says...

Besides this being off-topic

Off-topic where? You posted to alt.www.webmaster,
alt.websites, alt.internet.search-engines, and alt.html

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[Guy Macon]

Google creates a copy of your post on their server; so do thousands of
other servers. The other servers only keep their copies for a week or so;
Google keeps their copy for a lot longer.

Supernews keeps posts to text newsgroups for well over a year.