Microsoft 365 Backup cost for 50 users
At $0.15 per GB of protected content per month, a 50-user tenant with the assumptions below costs about $338 a month to protect everything, or about $218 a month under a scoped policy.
Cost summary
| Users | 50 |
|---|---|
| Protected storage | 2.2 TB |
| Monthly cost (everything) | $338 |
| Annual cost (everything) | $4,059 |
| Monthly cost (scoped) | $218 |
| Cost per user / month | $7 |
What this estimate assumes
These figures are built from a realistic storage profile for a tenant of this size, not from your own usage reports. Every assumption is named so you can change it in the interactive calculator.
- Mailbox: 8 GB per user
- Online archive: 10 GB per user
- OneDrive: 10 GB per user
- SharePoint: 500 GB total
- Recycle bin / recoverable items: 10% of live data
- Version history uplift on OneDrive and SharePoint: 15%
- SharePoint content with no activity in 12+ months: 40%
- Annual data growth: 20%
A scoped policy excludes online archives and stale SharePoint sites. For this tenant that drops the bill from $338 to $218 a month — a saving of $120 a month, or $1,445 a year — without removing anything you would realistically need to restore.
Why this is only an estimate
Microsoft's per-GB rate is fixed, but the total it is applied to depends on what is actually in your tenant. Archives, recycle bins and version history are billable but do not appear in the standard usage reports most people check, which is why real quotes often come in higher than the headcount-based figure. Use our PowerShell scripts to measure mailbox, archive and site sizes yourself.
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Frequently asked questions
How much does Microsoft 365 Backup cost for 50 users?
For this 50-user profile, protecting everything costs about $338 a month ($4,059 a year). A scoped policy that excludes archives and stale SharePoint sites drops that to about $218 a month.
What is included in the protected storage total?
The total includes primary mailboxes, online archives, OneDrive accounts and SharePoint sites, plus an estimated 15% version-history uplift on file workloads and a 10% recycle-bin/recoverable-items allowance. Those two are billable but usually missing from the usage reports most people check.
What is a scoped policy?
A scoped policy protects only the data you would realistically restore. For this scenario it excludes online archives and the 40% of SharePoint content estimated to have had no activity in 12 months. That reduces the bill without changing what matters.
Is this an official Microsoft quote?
No. This is an independent estimate based on Microsoft's published per-GB rate and the assumptions shown on this page. Use it for budgeting and planning, then confirm against your own tenant's usage reports before purchasing.
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