Microsoft 365 Archive: quotas and costs

A SharePoint site is almost full. An administrator archives older files and expects its limit to free up. The tenant does report data moving from active to archived storage, yet the site's usage remains unchanged. Both observations can be correct: site quota and active tenant consumption are different measurements.

According to the current FAQ, file-level archive changes neither the storage usage nor quota enforcement of an individual SharePoint site. At tenant level, however, it reclassifies data from active to archived consumption. A separate question is how much archived storage is actually billed after accounting for licensed capacity.

The following model covers commercial SharePoint and Microsoft 365 Archive with working pay-as-you-go billing. It excludes education pooled storage and the special rules for unlicensed OneDrive accounts. Documentation was checked on 20 October 2026. Calculations are our hypothetical examples, not an estimate of your tenant's actual invoice.

Separate three measurements

The Archive FAQ explicitly distinguishes site-level and tenant-level storage. An archived file remains included in its site's usage and limit. At tenant level, active consumption decreases and archived consumption increases by the same amount; archiving does not make the total stored data disappear.

If one site's limit is the problem, file-level archiving does not replace increasing its allocated quota or deliberately deleting or moving data. If the organisation is running out of active tenant capacity, changing the tier allocation can help. Write down which constraint you are addressing before making changes.

For example, a site has 1,000 GB allocated and reports 950 GB used. Moving 300 GB of its files into archive does not, under the FAQ, produce a site quota usage of 650 GB. You cannot automatically plan another 300 GB of active documents on that site. This illustrates the rule's consequence, rather than a measured migration result.

Archiving a file differs from archiving a site

Archiving an entire site removes ordinary access to it and requires site reactivation. File-level archive keeps the site operational while restricting normal access to selected archived files. The service overview and management guide describe these states separately.

Both states can exist together. If a file was archived before the entire site was archived, reactivating the site alone does not make that file active. An access plan must establish whether the site, the file or both need reactivation.

Archive is not an older recovery point and does not replace backup. Retention and eDiscovery continue to operate on archived content under their own rules; that does not guarantee recovery of historical document versions. Our article on retention, archive and backup explains their different purposes.

Not every archived GB is necessarily billed

The Archive pricing model accounts for already licensed SharePoint capacity. If active and archived content together fit within the allocated tenant capacity, no additional Archive storage charge arises. This does not make every related service free or remove the need to configure billing correctly.

For a working calculation, let licensed capacity be Q, active consumption H and archived consumption C, all in the same unit. In the usual case where active content does not exceed Q, the published examples imply billed archive volume of the greater of zero and H + C − Q. The condition H no greater than Q is part of this simplified model.

Hypothetical monthly example with unchanged volumes throughout the month: Q = 10,000 GB, H = 9,000 GB and C = 2,500 GB. C is an accurate total of archived data without double counting.

The model does not automatically apply the Archive rate to all 2,500 GB. If C were only 500 GB with the other assumptions unchanged, the 9,500 GB total would fit within Q and the additional Archive storage charge would be zero.

Keep the calculation in GB or another single unit. Do not mix decimal TB conversion with binary conversion and label the difference a metering error. The variable p allows contracted rates to be compared without an invented currency or tax conversion.

An overfull active tier has a separate cost

If H exceeds Q, do not use the previous simplified equation without a cap as the archive volume. It would include active data above quota. Microsoft's pricing scenarios distinguish additional standard capacity from billed archive storage.

For inventory allocation, the archive component in this model can be written as the smaller of C and the greater of zero and H + C − Q. Record the active shortfall separately as the greater of zero and H − Q. This is our algebraic expression of the published scenarios, not a replacement for the actual billing meter or permission to exceed limits indefinitely.

With Q = 10,000 GB, H = 10,500 GB and C = 1,000 GB, the model has a 500 GB active shortfall and a 1,000 GB archive component. You cannot multiply the whole 1,500 GB by the Archive rate and declare capacity resolved. Include how extra active capacity is obtained and its effect on Q in the actual quotation.

Do not count archived files twice

Current pricing documentation defines archive consumption as archived sites plus archived files on non-archived sites. Files already inside an archived site are not added separately again.

The 2,500 GB model could comprise 2,000 GB of fully archived sites and 500 GB of archived files on active sites. If you also report 300 GB of individually archived files inside those archived sites, that is not an extra amount above 2,500 GB. Adding it would create a 2,800 GB total from the same data.

The management guide identifies the ArchivedFileDiskUsed property in Get-SPOSite for file-level consumption, in bytes. Join each record to its site's state and convert into your chosen unit. The column alone cannot produce the correct total without knowing whether the site is also archived.

Free reactivation does not mean unrestricted switching

Microsoft's pricing documentation states that SharePoint content reactivation fees were removed from 31 March 2025. Do not use older SharePoint site reactivation charges as a current universal price list. The change does not automatically apply to unlicensed OneDrive accounts.

Re-archiving is also restricted. The pricing page calls this a four-month period; the management guide and overview explicitly specify 120 days for reactivated files. Do not convert these descriptions into a single estimated calendar deadline for every object type. Verify the particular state and available action at each step.

Reactivation can change the active/archive allocation. Moving 1,000 GB back to active storage in the first model yields H = 10,000 GB and C = 1,500 GB. The total remains 11,500 GB, and modelled billed archive volume remains 1,500 GB. A zero action fee is not the same as zero ongoing monthly cost.

Test Teams and clients separately

Archiving the main SharePoint site is not archiving an entire Teams team. Archive management describes limited support for teams with private or shared channels. SharePoint administration can block archiving the main site; PowerShell or Graph can archive the main site while these channel sites remain active. Channel sites themselves cannot generally be archived using this procedure.

For file-level archive, the client matters too. The current overview lists limitations affecting certain Office web applications, mobile clients, macOS synchronisation and applications reading the file as a data input, among others. A successful SharePoint web test does not establish that every mobile or synchronised access route will work.

Manual file archiving and an automated policy also have different licensing requirements. The FAQ distinguishes Microsoft 365 Archive from separately licensed lifecycle management in SharePoint Advanced Management. Enabled PAYG billing does not establish rights to every automation feature.

What happens when billing is disabled

The pricing document says that when Archive is disabled, or the associated billing is not working, content remains archived and can be reactivated. New archiving is blocked, and archived content counts as active standard consumption during that period.

This is not a way to avoid costs while keeping the same capacity result. Assign ownership of the Azure billing connection and checks of its health. A count of still-archived objects does not establish that they continue to be billed and counted in the same tier as before deactivation.

Evidence before a larger archive operation

1. Record whether you are addressing one site's quota, active tenant capacity or both.
2. Establish Q, H and correctly allocated C in one unit; eliminate double counting of files within archived sites.
3. Verify site types, Teams channels and the clients users actually use to open content.
4. Define required access and a realistic reactivation process. Include re-archiving restrictions and spare active capacity.
5. Separate consumption-based Archive rights from any SAM automation features; verify the billing connection and contracted rates.
6. Pilot representative content and record site and file states, both tiers' changes and the user experience.
7. Compare the model with the meter after actual consumption is recorded. Evaluate volume, quota and price changes separately.

If content needs to shrink rather than change tiers, see our SharePoint and version history cleanup procedure. Deletion has its own recovery and retention consequences; it is not automatically preferable to archiving.