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[SharePoint Online] is a collaboration platform. To foster collaboration across the organization, SPO facilitates the creation of intranet sites to house artifacts. Although an oversimplified breakdown, that’s the gist of it. And within each site, the artifacts can be any file type supported by the tenant. But bit-by-bit, these artifacts accumulate and take up space. Storage is NOT unlimited!

Because storage is limited, there are two storage quotas to be aware of…

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(1) SPO Site Collection Quota:

At this moment, each site collection has a total storage quota of 25 TB. SPO best practice discourages the creation of child-sites. But they are a part of the parent site’s total storage. Instead, all sites should be created as site collections. Microsoft currently supports 2 million site collections per tenant and each one has a 25 TB quota.

• E.g., Storage Metrics of the root SPO site.
  • https://<tenant name>.sharepoint.com/_layouts/15/storman.aspx

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NOTE: Account must be a Site Collection Administrator to view.

• E.g., Site Permissions > Advanced Permission Settings > Site Collection Administrators
  • https://<tenant name>.sharepoint.com/_layouts/15/mngsiteadmin.aspx

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(2) SPO Tenant Quota:

While each site collection lives in a silo, they live under the same Office 365 tenant. Yes, each site collection has a storage quota of 25 TB, but that doesn’t guarantee that the tenant has that much storage allocated. From the SharePoint Admin Center, one can review their total tenant storage. This tenant quota is the organization’s storage allocation. Total storage CANNOT exceed this quota…

• E.g., Storage quota of the SPO tenant.
  • https://<tenant name>-admin.sharepoint.com/

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NOTE: Account must be a SharePoint administrator of SPO tenant.

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Conclusion:
Tenants can have millions of SharePoint Online sites, but the cumulative storage of each site counts against the tenant storage allocation. In spite of each site collection having a 25 TB quota, the tenant storage quota may be much lower.

“Racism is a grown-up disease, and we should stop using our kids to spread it.”

Ruby Bridges

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