Hi,
Follow these steps to resolve the issue:
Go to the properties of the Backup to Disk Folder and select the 'Configuration' tab.
Uncheck the Option 'Auto Detect Settings'
Check the option 'Buffered reads' and let 'Buffered writes' remain checked.
NOTE : If we do not receive your reply within two business days, this post would be marked "assumed answered" and would be moved to "answered questions" pool.