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SharePoint Online and OneDrive for Business Backup Jobs Fail with (403) Forbidden Warning Message

KB ID: 3104
Product: Veeam Backup for Microsoft Office 365 | 3.0 | 4.0 | 5.0
Veeam Backup for Microsoft 365 | 6.0 | 7.0 | 7a | 8
Published: 2020-02-13
Last Modified: 2023-03-16
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Challenge

SharePoint Online or OneDrive for Business backup jobs fail with the following message: 
Processing site https://site.sharepoint.com/sites/111/subsite finished with warning: 
Failed to backup item version: //1024/Shared Documents/, version: 2.0, 
The remote server returned an error: (403) Forbidden. :: 0:00:21

Cause

Due to limitations of file version history, files cannot be downloaded.

Solution

To confirm the limitations of history of file versions, do the following:

  1. Open the affected OneDrive or Site in the Web-browser.
  2. Find the file that cannot be downloaded and open Version history.User-added image
  3. Left-click the date.User-added image
    • If the 403 error appears, that means that the file is inaccessible in Office 365. Make sure to contact Microsoft Technical Support.User-added image
    • If you are getting any other error, contact Veeam Technical Support.
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