You can restore mailboxes by AD groups in Exchange Online to another mailbox. Only the backed up mailboxes that are a part of the AD group will be restored.
Procedure
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From the navigation pane, go to Protect > Office 365.
The Office 365 Overview page appears.
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On the Apps tab, click the app.
The Overview page of the app appears.
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Click on Restore on the upper-right area of the page.
The available Restore options tool appears.
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To restore groups of mailboxes, select Restore mailboxes by AD Group, and then click Next.
All AD groups appear in a list.
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From the list, select the backed up groups you want to restore and then click Next.
You can use the Search bar to filter and find the AD group items you want to restore.
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On the Destination tab, under Exchange Online, select Restore the data to another location, specify the location for the restore, and then click Next:
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To specify a different destination client for the restore, move the Restore to a different client toggle key to the right, and in the Destination client list, select an Exchange Online app.
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To restore to another mailbox, in the Mailbox box, click Browse, select a mailbox from the list, and then click Submit.
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To restore to a specific folder location, in the Folder box, click Browse, select a folder from the list, and then click Submit.
The Options tab appears.
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Beside If the message exists, specify which items to include in the restore:
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To not overwrite existing items, select Skip.
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To overwrite existing items, select Unconditionally overwrite.
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To include deleted items, select Include deleted items.
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Specify additional details for the restore, and then click Next:
The Review tab appears.
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Review the items you selected for restore, and then click Submit to start the restore operation.
The Summary tab appears.
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Click Close.