OneDrive / SharePoint Backup Fails with "Error: Invalid MIME content-length header encountered on read."

Challenge A backup job for OneDrive or SharePoint items processed by Veeam Backup for Microsoft 365 fails when attempting to download certain item versions, displaying the following error: Invalid MIME content-length header encountered on read Cause The issue is related to the download process us...

SharePoint or OneDrive Backup fails with 'Cannot complete this action'

Challenge A backup attempt for SharePoint Online and OneDrive objects may fail with the following message: Cannot complete this action. Please try again. Total count of failed items: N Underlying Error: Server error of type Microsoft.SharePoint.SPException occurred: -2147467259 Cannot complete th...