Kurt Shintaku's Blog

A quick reminder of how much storage your organization is entitled to based on the service being used and the number of users licensed:

• Exchange Online provides 100GB per mailbox for M365 E3/G3+ subscribers.  This is no adjustment to this.  No reductions, no increases.  You cannot buy more mailbox storage.  Excess capacity needs to be archived using Exchange Archiving service.
  https://learn.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#mailbox-storage-limits

• OneDrive for Business provides 1TB per M365 G3/G5 subscriber.  This may be upgraded to 5TB for a specific user if the user has consumed 95% of their storage.  This is done via PowerShell or the SharePoint Admin Center.
  https://learn.microsoft.com/en-us/sharepoint/change-user-storage#change-a-users-storage-space-in-the-microsoft-365-admin-center

• SharePoint Online is pooled storage.  The amount of storage provided is “1TB+10GB/user” w/ M365 E3/G3+.  If an organization, for example, has 600 users, it would have 1TB+(10GB*600) = 7TB of storage in SharePoint Online to use across all sites. (And Microsoft Teams – see below) 
  https://learn.microsoft.com/en-us/office365/servicedescriptions/sharepoint-online-service-description/sharepoint-online-limits
  Additional SharePoint Online storage may be purchased/subscribed to via an Enterprise Agreement SKU called “Office 365 Extra Storage”.
  https://learn.microsoft.com/en-us/sharepoint/sharepoint-storage-planning#purchase-additional-storage
  
• Microsoft Teams files are hosted in SharePoint Online. Any files stored in Teams folders consumes SharePoint Online storage quota shown above. Files shared in Teams file folders are actually visible through both Teams client/web as well as SharePoint Online.
  https://learn.microsoft.com/en-us/microsoftteams/limits-specifications-teams#storage

A NOTE ABOUT STORAGE ROBUSTNESS:
Some folks are unaware that SharePoint Online storage & OneDrive for Business storage a very different:

• SharePoint Online storage is designed for ORGANIZATIONS.  It is a “higher quality” service in that it is specially architected for high volume, organizational use.  The data is both locally & geographically redundant.  It’s designed for rapid “journaling” and “previous versions” & designed for highly scalable sharing for multi-user synchronization & multi-user co-editing.  It has significantly higher performance SLAs and has a lot of administrative control such as storage management, site quotas, governance policies, etc. This is why organizations get “1TB+10GB/user” vs OneDrive for Business where users get “1TB+/user” in M365 E3/G3+.
  
• OneDrive for Business is designed for INDIVIDUALS.  While locally protected from both hardware failures, I don’t believe it is georedundant like SharePoint Online is.  While it’s availability SLAs are 99.9% like SharePoint Online, it has lower access performance SLAs than SharePoint Online and is not designed for multi-user access. This includes speed/performance for multi-person co-editing, file sync with multiple people, etc.  I believe there can also be a higher latency between journaled changes and “previous versions” vs SharePoint Online.  At the end of the day, OneDrive for Business designed and optimized for a single user as you’d expect.  This is also the reason licensed users get “1TB+/user” vs SharePoint Online’s “1TB+10GB/user” in M365 E3/G3+.