Microsoft 365 Backup is the native service for Exchange, SharePoint, and OneDrive data. It is convenient and billed by the gigabyte, which is where the cost question starts.
Microsoft 365 Backup protects platform data on a pay as you go per gigabyte meter. This guide sets out the pricing, what drives the cost, and how the native service stacks against a third party backup contract.
Microsoft 365 Backup is the native service that protects Exchange, SharePoint, and OneDrive data inside the platform. It is convenient, fast to restore, and billed by the gigabyte, which is where the cost question starts.
This guide sets out how the service is priced, where the per gigabyte meter runs away, and how it stacks against a third party backup contract.
Microsoft 365 Backup is billed on a pay as you go meter per gigabyte of protected data per month, charged to an Azure subscription. Microsoft documents the service on its Microsoft 365 Backup page and in the backup overview.
Because the charge lands on Azure consumption, it sits outside the Microsoft 365 seat line and needs its own budget owner and alert. The licensing documentation keeps the two lines distinct.
The bill is a function of data volume and retention, not user count. Both grow quietly, so the meter grows with them.
What moves the Microsoft 365 Backup bill
| Driver | Effect on cost | Often overlooked | Buyer side move |
|---|---|---|---|
| Data volume | Directly scales the meter | Old SharePoint sites | Archive before backup |
| Retention period | Longer means more stored | Default long retention | Match policy to need |
| Workload scope | More workloads, more data | Backing up everything | Scope to critical data |
| Growth rate | Compounds month on month | Unmanaged sprawl | Govern data growth |
Retention multiplies stored volume. A long default applied to every workload stores far more than the recovery requirement needs, and the meter charges for all of it.
Native backup wins on integration and restore speed. Third party tools often win on retention economics, cross platform coverage, and storage choice.
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The standard line is that native backup is obviously the right choice because it is built in, so you should switch off the third party tool and move everything to Microsoft. We disagree. In the estates we modeled, the per gigabyte meter on long retention scaled past the flat cost of the incumbent tool, and buyers ran both for months without cancelling either. The buyer side move is to model data volume and retention against the third party contract first, scope native backup to the workloads where its restore speed and short retention win, and avoid paying two backup bills for the same data. Built in is not the same as cheapest.
Source: Redress Compliance advisory engagement file, 2024 to 2025.
Native backup is priced by the gigabyte and the month. The retention default nobody questioned is what turns a convenience into a recurring bill.
Decide from a data and retention model, not the convenience pitch. The per gigabyte meter rewards discipline and punishes defaults.
Estimate protected volume and retention by workload, then project the meter over three years. Compare that figure against the incumbent contract before switching anything off.
Protect the data that genuinely needs platform native recovery and leave bulk or archival data to cheaper storage. The backup overview sets out the supported scope.
Microsoft 365 Backup is billed on a pay as you go meter per gigabyte of protected data per month, charged to an Azure subscription rather than as a per user seat license. The cost is driven by the volume of data under protection and how long it is retained.
The native service protects Exchange Online, SharePoint, and OneDrive data inside the Microsoft 365 platform, with fast restore through native integration. It does not cover platforms outside Microsoft 365, which is one reason some estates keep a third party tool for broader coverage.
Cost is driven by protected data volume, retention period, workload scope, and data growth rate, not by user count. Long retention defaults applied across every workload store far more than the recovery requirement needs, and the per gigabyte meter charges for all of it.
Not always. Native backup wins on restore speed and simplicity and is economical at short retention, but third party tools with flat or tiered storage can beat the per gigabyte meter at long retention. The right answer comes from modeling data volume and retention against both options.
It can for in platform workloads where fast native restore and modest retention are the priority, but it does not cover non Microsoft platforms and can cost more at long retention. Many estates briefly run both, so the duplicate tool should be retired only after the comparison is made.
Control cost by trimming long retention defaults, scoping protection to data that genuinely needs platform native recovery, archiving old SharePoint and OneDrive data before backup, and assigning an Azure budget owner and cost alert to the meter so growth is visible early.
Because data volume and retention both grow quietly while user count stays flat, the meter grows with the data rather than the headcount. Unmanaged SharePoint sprawl and a long default retention applied to every workload are the most common reasons the bill scales faster than expected.
Microsoft 365 Backup bills to Azure consumption, separate from the Microsoft 365 seat line, so it needs its own budget owner and cost alert. Keeping the two lines distinct prevents the backup meter from being lost inside the larger suite spend and growing unnoticed.
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