You can restore mailboxes by AD Group in Exchange Online to a PST file.
Procedure
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From the Command Center navigation pane, go to Protect > Microsoft 365.
The Microsoft 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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At the top-left area of the page, click Restore.
The Restore options tool appears.
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On the Destination tab, select File Location, configure the restore destination, and then click Next.
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From the Server list, select the server where the data will be restored.
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From the File type list, select PST.
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Beside the Path list, click Browse, select a folder from the list, and add a file name for the restore that includes the .pst file extension. For example: C:\RestoredFiles\RestoredMsg1.pst.
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Click Save.
The Options tab appears.
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Configure options for the restored messages, and then click Next:
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To include deleted items in the restore, select Include deleted items.
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To restore a large data set to multiple PST files, select the Limit PST size to check box, and then enter the maximum size for the PST files. You cannot enter a value that is greater than 45 GB.
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.