Enable backups for OneNote
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By default, backups for OneNote notebooks are note enabled. If you want your OneNote notebooks backed up, you must enable the backup in the desired service.
Steps
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Click Services from the left navigation pane.
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Click Microsoft 365.
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Under Manage Services, click the backup settings icon next to the service that you need to update.
A list of your backup settings available for the selected service is displayed.
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Select ENABLE ONENOTE BACKUP.
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Click Confirm.
Notebooks will be included in the next scheduled backup. If you want them backed up immediately, perform an immediate backup.