A mailbox is a storage space in Office 365 for email, contacts, and calendar items. When you back up a mailbox, you back up the data in the mailbox.
You can back up mailboxes by using the Office 365 PowerShell cmdlets or the Azure Storage Explorer.
You can use the Office 365 PowerShell cmdlets to back up mailboxes to a local disk or to Azure Blob storage. You can also use the cmdlets to restore mailboxes from a backup.
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