SharePoint Online is hosted on Office 365. SharePoint sites are not "backed up" in the traditional sense. Deleted sites can be restored within 93 days of deletion. Deleted files can be restored from the User or Site Recycle Bin (2nd stage Recycle bin).

For information on restoration of deleted files, see Article 100775 "How long are deleted items restorable in SharePoint?

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Last updated: 
September 30, 2021