This was a restore to a new disk where a partial restore had been done before. It occurred long after the copy started. So maybe, like Restore and Restore to, give more options at the start like Overwrite (to automatically replace) and Prompt (the current default).
I was about to ask for more "robocopy" like switches like exclude changed, exclude older etc. but realised that would be repeating functionality already in many other tools like robocopy itself. And in the case above, using robocopy would have prevented the prompt but hindsight is a wonderful thing
