How to Manage Preservation Hold Library in Microsoft 365
Introduction When you start using retention policies in Microsoft 365, one of the first surprises many admins encounter is the sudden appearance of a mysterious Preservation Hold Library in SharePoint sites and OneDrive accounts. This hidden library sparks immediate questions and concerns—especially around unexpected storage spikes or frustrating attempts to delete files that just won’t go away. A Preservation Hold Library is automatically created in SharePoint and OneDrive whenever retention policies or legal holds are applied to content there. It works by silently preserving copies of deleted or edited files, protecting your data from accidental or intentional removal to ensure compliance during audits or investigations. When items are changed or removed, SharePoint uses a copy‑on‑write process to store earlier versions in the Preservation Hold Library—behavior that can noticeably increase storage consumption over time. ...