Microsoft 365 is not backed up, and Microsoft says so
12 July 2026 · 6 min read · Optimum IT Solutions
This is the assumption that catches out more small businesses than any other: that because your email and files live in the cloud, someone is backing them up. They are not.
Retention is not backup
Microsoft runs 365 on what they call a shared responsibility model. In plain terms, they keep the service running and the data available. Protecting your content against your own mistakes is your job, not theirs. They say this openly in their own service agreement.
What 365 gives you is retention: a deleted item sits in a bin for a set number of days, then it is gone. That is useful, and it is not the same as a backup. Retention has a clock on it, it can be turned off, and it does not save you from the two things that actually lose data.
The two things that really lose data
Almost every real loss we get called about comes down to one of these.
- A deleted account. Someone leaves, the account is removed to save a licence, and a few weeks later you need something from their mailbox or their files. Once the retention window closes, it is gone.
- Ransomware or a compromised account. If an attacker or a piece of malware encrypts or deletes your content, 365 faithfully syncs that change everywhere. The cloud copy is now the bad copy.
What a real backup does
A proper third party backup keeps its own separate copies of your mail, calendars, contacts, OneDrive, SharePoint and Teams, on its own schedule, that you can restore from at a point in time. That means recovering a single deleted folder from three months ago, or rolling a whole account back to the morning before it was hit.
The part that matters, and the part people skip, is testing the restore. A backup you have never restored from is a hope, not a safety net. We test restores with clients rather than setting it up and forgetting it.
Do you actually need it?
Honestly, it depends. If your business would limp on for a week without last month's emails, you can weigh it up. If losing your mailbox history, your shared files or a departed colleague's records would genuinely hurt, then the cost of backup is small next to the cost of finding out the hard way.
If you are not sure which camp you are in, ask us. We would rather tell you it is fine to wait than sell you something you do not need.
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