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Question

OneDrive file count / storage reported by Microsoft versus Commvault

  • January 27, 2026
  • 1 reply
  • 25 views

Ken_H
Challenger
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The M365 admin center reports my OneDrive as having 2.8M files consuming 8.1TB of space.

But when I go into Commvault I see numbers that are totally different. In Commvault I see either 1) the latest backup had 3.2M active and 0.7M Inactive for a total of 3.9M files or 2) all backups with 6.6M Active and 2.0M inactive for a total of 8.6M files.

Likewise, the disk space used is reported as either 1) the latest backup with 3.4TB Active and 1.6TB Inactive for a total of 5.0TB or 2) 9.6TB Active and 4.0TB inactive for a total of 13.6TB.

Is there any way to drill down into Commvault to figure out why the numbers – particularly the “latest backup” file counts – are so different from what is reported by Microsoft?

1 reply

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  • Vaulter
  • February 1, 2026

Hi ​@Ken_H 
Good day!

 

The differences you are seeing between Microsoft 365 (OneDrive) and Commvault backup statistics are expected due to how each platform calculates and reports file counts and storage usage.

Here’s how to understand and investigate these discrepancies:

Why the Numbers Differ

 

***********Microsoft 365 Admin Center*****************

Reports the total number of files and storage, including all file versions and items in the Recycle Bin (user and tenant level).
The reported size is inflated by file versioning and deleted items.

 

**********Commvault********************

-- By default, only the latest version of each file is backed up.
-- Recycle Bin contents are not backed up.

Active: Files still present in OneDrive.
Inactive: Files deleted from OneDrive but retained in backup (according to your retention policy).

The sum of active and inactive files in Commvault may exceed what Microsoft reports, especially if many files have been deleted but are still within retention.