How to Safely Delete 500,000 Files from a Synced SharePoint and OneDrive Library
Question details
An organization needs a reliable method to delete approximately 500,000 archived files from a SharePoint library that is actively synchronized to 150 users via OneDrive.
- Product
- SharePoint and OneDrive
- Device & OS
- not provided
- Scenario
- Performing a bulk deletion of archived files from a globally synced document library while ensuring users' local environments are updated correctly.
- Observed behavior
- The goal is to ensure all deleted files are completely removed from users' local synced folders during synchronization without reappearing or causing severe disruptions.
Before initiating a massive deletion, strongly consider notifying all users of the upcoming sync activity, as processing hundreds of thousands of changes will consume bandwidth and may take several hours to reflect on all devices.
Delete the Files Directly from SharePoint Online
The safest and most reliable method is to perform the bulk deletion directly in the cloud (SharePoint web interface or PowerShell), allowing the OneDrive client to push the deletions down to the users.
Deleting massive amounts of data from a local synced folder can overwhelm the OneDrive sync client and cause throttling or sync conflicts. Instead, triggering the deletion from the server side ensures that the cloud acts as the source of truth.
Notify your organization that a large sync event is scheduled. Advise them to leave their devices powered on and connected to the internet to allow OneDrive enough time to process the changes.
Log into your Microsoft 365 admin account and navigate to the target SharePoint Document Library. Select the archived folders or files and click 'Delete' from the top ribbon. For 500,000 files, it is highly recommended to use a PnP PowerShell script to automate the removal and avoid browser timeouts.
Once the files are removed from the SharePoint server, the OneDrive sync clients on the 150 users' machines will detect the cloud deletions. OneDrive will automatically begin removing the corresponding local files from their synced directories.
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Frequently Asked Questions
Will deleted SharePoint files leave a local footprint on users' computers?
No, as long as the files were only stored within the OneDrive synced folder, the sync client will completely remove the local copies. Files will only remain if a user manually copied them to an unsynced local directory, such as a local Desktop or external drive.
How long will it take to sync 500,000 file deletions?
Syncing massive changes can take anywhere from a few hours to a full day. The duration depends heavily on the users' internet connection speeds, the processing power of their local devices, and potential Microsoft server throttling.
Can I delete the files from my local synced folder instead of the SharePoint web interface?
While technically possible, deleting 500,000 files locally is not recommended. It places immense strain on your device's OneDrive client and could result in sync errors, timeouts, or accidental file restorations if other users are simultaneously editing files.
What happens if a user is offline during the deletion process?
The OneDrive client will register the cloud deletions the next time the user's device connects to the internet. It will then begin processing the queue and removing the local files from their synced directory.
