You can add all public folders to Exchange Online backup content so that public folders are automatically discovered and backed up when new public folders are added.
All public folders appear as a separate entity on the Mailboxes and Content tabs. After you add all public folders as content, you can back up and restore all public folders like an entire mailbox or back up and restore individual items within the public folders.
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 user 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 the following Exchange Online 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, in the upper-right area of the page click Add.
The Configure Content page appears.
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Select Add content to backup, and then click Next.
The Add Content tool appears.
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Select Mailboxes.
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Under Advanced, select All public folders, and then click Next.
The Content tab appears.
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Click Next.
The Office 365 Plan tab appears.
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From the Office 365 plan list, select the plan to use for the public folders, and then click Next.
The Summary tab appears.
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Click Submit.