I have a problem with the Back up and restore facility. I have never understood it to be honest. A little balloon keeps popping up saying that my OS recovery disk is full. I dont know how it can be. But its annoying - I click on the balloon and it offers to clean up the files and then tells me O files can be cleared Can I clear all of this OS disk and just start again as Im sure Ive done stuff in the past where I have just duplicated the files.