Google Groups - Use Conversation History to archive your Group messages

If you’re a manager of a Google Group, you can turn on Conversation History to archive and manage your Group messages from the Google Groups interface.
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Sign in to Google Groups.

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Click the name of a group.

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On the left, under Group Settings click General.

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Under Posting Policies, turn Conversation History on. Make sure to save your changes.

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Conversation history can be viewed under the Conversations header on the left.

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You will be able to review and manage Group messages as they come in from this view.