Microsoft 365 Backup: Why Microsoft Doesn't Back Up Your Data
Microsoft keeps the service running. You are responsible for the data. Here is what that means for Exchange, SharePoint, OneDrive, and Teams.
One of the most common misconceptions in small business IT is that Microsoft 365 includes backup. It does not. Microsoft operates under a shared responsibility model. They guarantee the platform is available and resilient. You are responsible for protecting your data against accidental deletion, malicious deletion, ransomware, and long-term retention needs.
The built-in retention features in Microsoft 365 are useful but limited. Deleted items in Exchange typically recover within 14 to 30 days. SharePoint and OneDrive recycle bins hold items for around 93 days. Teams chat history follows separate, often shorter, rules. After those windows, the data is gone unless you have a real backup in place.
A proper Microsoft 365 backup strategy covers:
- Exchange Online mailboxes, including shared and resource mailboxes.
- OneDrive for Business, including files belonging to former employees.
- SharePoint Online sites, document libraries, and version history.
- Microsoft Teams chats, channels, and associated files.
- Long retention windows, ideally years, not weeks.
- Immutable storage so a ransomware actor or malicious insider cannot delete the backups.
- Regular restore testing, because a backup you have never restored is a guess.
Third-party backup services for Microsoft 365 are inexpensive and straightforward to deploy. For most small businesses, the cost is a few dollars per user per month, and the recovery experience is dramatically better than relying on the native recycle bin.
Realm Defense helps Ventura County small businesses evaluate Microsoft 365 backup options, configure retention that actually matches their compliance and operational needs, and run a real restore test so you know it works. Reach out for a backup review.