Microsoft 365 Does Not Back Up Your Data — Here's What You Need Instead

This is one of the most common misconceptions among small business owners across Forsyth County and North Atlanta. They're paying for Microsoft 365, their files live in OneDrive or SharePoint, their email runs through Exchange Online — and they assume that means their data is backed up. It isn't. Not in the way you think.

The Microsoft Shared Responsibility Model

Microsoft is responsible for keeping the 365 platform running — their servers, their uptime, their infrastructure. They are not responsible for your data. What that means in practice: if you accidentally delete a file, Microsoft will let you recover it, but only for a limited time. Email items can typically be recovered for 30 days from the Deleted Items folder. Files in OneDrive have version history, but that history has retention limits. After those windows close, the data is gone.

Microsoft calls this the "Shared Responsibility Model." They handle the platform. You handle your data. Most businesses don't know that second part is on them.

What M365 Actually Protects — and What It Doesn't

What it does: Keeps your email running, syncs files across devices, manages Teams conversations, handles authentication. If a Microsoft data center has a problem, they restore service.

What it doesn't do: Protect you from accidental deletion, ransomware that encrypts your OneDrive files, a disgruntled employee wiping shared drives, or a malware attack that corrupts your mailbox data.

Ransomware in particular is a problem with M365 setups. Modern variants have learned to target cloud-synced storage. If ransomware hits a workstation and your OneDrive is synced locally, the encrypted files can push back up to the cloud — overwriting your clean versions.

Real Consequences, Real Businesses

One scenario: a departing employee accidentally deleted a shared folder containing three years of client project files. The files weren't recovered because they'd passed Microsoft's retention window. Another: a ransomware attack encrypted local files that synced back to SharePoint before anyone caught it. Neither of these is Microsoft's fault — they did exactly what they said they would do. The problem was no backup strategy was in place.

What You Actually Need

A proper backup for Microsoft 365 means a third-party tool that independently copies your data — email, SharePoint, OneDrive, Teams — and stores it separately from your M365 environment. Carbonite for Microsoft 365 is one option we deploy for clients. It runs continuous backups and gives you point-in-time restore. If ransomware hits, you roll back to a clean version from before the attack.

There are other solid options — Veeam, Barracuda, Acronis — depending on your size and budget. The important thing isn't which tool you use. The important thing is that something is running.

What to Do This Week

• Confirm whether you have any third-party M365 backup tool in place. If you don't know, the answer is probably no.
• Check what your Microsoft retention settings are (or ask your IT provider).
• Make a decision about backup before you need it — not after.

This is a solvable problem. It's not expensive relative to what data loss actually costs a business. And once it's running, you don't have to think about it again.