Google Takeout is a fantastic way to export user data. Takeout creates an archive of data from a user’s Google products. This can then be used for backup purposes or to migrate to another cloud solution. Google Takeout is already available for many Google services including Gmail, Drive, and Calendar. Announced today is the addition of Google Groups for Business.
The addition of Groups for Business to Takeout allows group owners to download a JSON file containing a list of member email addresses for each group that they own when using the Takeout service. This includes any groups created in the Admin console as well as those created in Google Groups for Business. As of yet, this does not allow for the download of messages from the groups directly.
Google Apps administrators can enable or disable the Takeout service via the Admin console at: Apps Additional Google Services. If you cannot see Google Takeout in the list of services, click on the filter icon and uncheck Show top featured services.
You can learn more about Google Takeout in the Help Center