# Microsoft 365 backup gaps

> Live situation record from CLSTR: https://clstr.news/situations/microsoft-365-backup-gaps
> Updated: 2026-07-29T16:59:49.000Z. Sources: 4. Developments: 2.

The first snapshot (27 July 2026) outlines the four ways Microsoft 365 calendars can be shared and notes that the native Microsoft 365 Backup service protects Exchange Online, OneDrive and SharePoint but does not back up Teams chat content. It recommends third‑party backup providers for broader coverage, longer retention and immutable storage.

The second snapshot (29 July 2026) expands on the backup shortfalls, adding that Teams, Planner and Power Platform workloads are also excluded from automatic backup. It details the limited retention for Power Platform environments and the need for sandbox‑based restores. The note further highlights migration‑related data‑loss risks, such as undocumented mailboxes, missing SharePoint sites and synchronization gaps during hybrid moves, urging thorough planning and post‑migration validation.

## Timeline

### 2026-07-29: Microsoft 365 Backup Gaps and Migration Data‑Loss Risks Highlighted

Microsoft 365 workloads like Teams, Planner, and Power Platform lack automatic backup; retention is short and restores limited. Migration projects often miss hidden data, causing loss unless carefully scoped, s

2 sources. https://clstr.news/cluster/microsoft-365-backup-gaps-and-migration-dataloss-risks-highlighted

### 2026-07-27: Microsoft 365's shared calendar guide and backup gaps for Teams chats

Microsoft 365 details shared calendar setups and notes its native backup omits Teams chats, prompting use of third‑party solutions.

2 sources. https://clstr.news/cluster/microsoft-365s-shared-calendar-guide-and-backup-gaps-for-teams-chats

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Cite as: Microsoft 365 backup gaps. CLSTR, https://clstr.news/situations/microsoft-365-backup-gaps