If you are getting the error “Request is not supported” when trying to perform a backup then you need to look at the computer that is trying to perform the backup.
Ever wonder what all those services are running on your Microsoft Windows O/S and what’s safes to stop or disable to free up more resources? Here’s few helpful links that should help out.
If you are working in IT support then its probably time you start looking at Windows 10 to prepare for its official launch. Microsoft have already released a free technical preview that is available in ISO.