Go to Admin > Settings and select the Export Group Data button at the top.? From there, you can choose which parts you want to download.? The site will create a zip file containing your choices and send you an email with the download link you when it's ready.
Duane
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Help:
/static/helpGMF's Wiki:
/g/GroupManagersForum/wikiSearch button at the top of Messages list
A few site FAQs:
/static/pricing#frequently-asked-questions