OneDrive File Issues

Fix OneDrive Folder Using More Storage Than Visible Files

Maira Mehtab Sep 28, 2026 869 views

Question details

A user notices that a OneDrive folder is reporting drastically higher storage consumption (e.g., 28 GB) than the actual size of the visible files (e.g., 76 MB).

Product: OneDrive for Business
Device & OS: Mac, Web interface
Scenario: Checking online storage usage metrics and attempting to free up space in a OneDrive account.
Observed behavior: The storage metrics display massive space consumption that does not align with the visible files stored in the local Mac folder or the standard web interface.

Before you start

Ensure you are logged into the OneDrive for Business web interface with an account that has permission to view Site Settings and Storage Metrics. Emptying your standard recycle bin first is also recommended to rule out normally deleted files taking up space.

Solution 1Recommended

Check Storage Metrics for a Preservation Hold Library

Verify if a Microsoft 365 retention policy is keeping hidden copies of your deleted or modified files and counting them against your storage limit.

In OneDrive for Business, organizational retention policies or eDiscovery holds can force the system to retain deleted and modified files behind the scenes. These files are moved to a hidden Preservation Hold Library, which continues to consume your storage quota even though the files are invisible in your regular folders.

Access OneDrive Web Interface

Navigate to Storage Metrics

Click the gear icon (Settings) in the top right corner, select 'OneDrive settings', click 'More Settings' on the left panel, and then choose 'Storage Metrics'.

Locate the Preservation Hold Library

Review the list of folders and their sizes on the Storage Metrics page. Look for a folder named 'Preservation Hold Library'. If this folder is occupying a large amount of space, it explains your storage discrepancy.

Contact Your Administrator

Because retention policies are enforced at the organizational level, you cannot manually delete these files. Ask your Microsoft 365 Administrator to review and potentially adjust the retention settings applied to your account.

Solution 2

Open a Microsoft 365 Support Ticket

Request backend analysis from the Microsoft service team if no Preservation Hold Library is found.

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Frequently Asked Questions

What is a Preservation Hold Library in OneDrive?

The Preservation Hold Library is a hidden folder in OneDrive for Business that automatically stores copies of modified or deleted files when an organizational retention policy or eDiscovery hold is applied to your account.

Can I manually delete files from the Preservation Hold Library to free up space?

No, standard users cannot manually delete or clear files from the Preservation Hold Library. The Microsoft 365 administrator must modify or remove the retention policy applied to your account before those files can be permanently removed.

Why doesn't the Mac Finder show the true size of my OneDrive folder?

Mac Finder only calculates the size of the visible files and folders currently synced to your local drive. It does not account for hidden backend elements on Microsoft's servers, such as the Preservation Hold Library or extended version histories.

Do file versions count against my total OneDrive storage limit?

Yes. In OneDrive for Business, older versions of your files are saved automatically. All retained versions count toward your overall storage quota, which can also contribute to discrepancies between local visible file size and total online storage usage.

Document & File Issues