M365 SecureStore - Troubleshooting Backup Job Errors

At times, backup jobs may encounter warnings or errors while trying to backup data. Below are some common scenario and solutions to fix them.

Failed to Backup a SharePoint Item

Job Error:

Processing site: [SharePoint site] completed with warning: Failed to backup item: [SharePoint path of affected item], Download timeout exceeded (last error: The response status code does not indicate success: 416 (Requested Range Not Satisfiable).). All retry attempts failed. Re-run the backup job to proceed.

Solution:

Please try to manually download the exact item directly from the SharePoint Web UI at [SharePoint site] using its full path [SharePoint path of affected item].
This is the quickest way to confirm whether the source item itself can be served correctly by Microsoft 365.

If manual download above works, please replace the source item with a fresh copy of the item by downloading it, then uploading it back to the same SharePoint library with the same content, and re-run the backup job.

If the manual download above does not work because item is corrupt, delete the item and re-run the backup job.