Getting started with backing up Exchange Online includes completing the Office 365 guided setup—which helps you perform some of the required setup tasks—adding a mailbox, and performing a test backup and restore.
Procedure
What to Do Next
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To back up all Active Directory users, add the Active Directory group to the Exchange Online app.
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For security reasons, consider replacing the global administrator role with the Exchange administrator role.
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Monitor backup activity to maintain a functional environment.