Microsoft 365 Backup storage calculator
The billable total is larger than the usage reports show. Add your mailbox, OneDrive and SharePoint numbers — plus the archives, recycle bins and versions Microsoft 365 Backup protects — and see the protected storage the meter will charge.
Protected storage estimate
| Line item | Size |
|---|---|
| Live data total | 15.4 TB |
| Protected total (full scope) | 17.8 TB |
| Protected total with scoping | 9.4 TB |
Estimated cost
| Scope | Monthly | Annual |
|---|---|---|
| Full scope | $2,738 | $32,858 |
| Scoped (excludes archives + stale sites) | $1,440 | $17,279 |
Native and per-user pricing land in the same range. Decide on coverage and retention, not price.
Run the full cost calculator Get real sizes with PowerShell
Frequently asked questions
What is Microsoft 365 Backup storage?
It is the total protected size of Exchange Online mailboxes and archives, OneDrive accounts, and SharePoint sites that Microsoft 365 Backup is configured to protect.
How do I calculate Microsoft 365 Backup storage?
Add mailbox, archive, OneDrive and SharePoint sizes, then add uplifts for retained versions on file workloads and recycle-bin content across all workloads.
Does Microsoft 365 Backup charge for inactive SharePoint sites?
Yes, if the sites are included in the backup policy. Excluding inactive sites is one way to reduce the bill.
How much does Microsoft 365 Backup storage cost?
Microsoft 365 Backup bills at $0.15 per GB of protected content per month.
What counts as billable storage but is not in the usage report?
Online archives, deleted items in recycle bins, and retained file versions are billable but typically not shown in standard Microsoft 365 usage reports.
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