To automatically discover and back up all public Exchange Online folders, add the public folders to an Exchange Online app.
Before You Begin
To back up and restore public folders, you must configure a service account that meets the following requirements:
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The service account must be an online mailbox or a shared mailbox.
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The service account must have owner permissions at the root level.
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Run below ExchangeOnline> Powershell command to assign owner permission to service account for root and sub-folders
You must run this command each time new public folders are added to the Exchange Online app.
Get-PublicFolder -identity "\" -Recurse | Add-PublicFolderClientPermission -user serviceaccount@domain.com -AccessRights Owner
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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On the Content tab, click Add, and then select All Public Folders.
The Edit association dialog box appears.
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Select the Office 365 plan to use for the public folders, and then click Save.
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To back up the public folders immediately, do the following:
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In the All public folders row, click the action button , and then select Back up.
A message prompts you to confirm submission of the job.
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Click Yes.
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After the backup completes, to view the backed-up public folders, on the Office 365 app page, in the row for the app, click the action button , and then click Restore.