online backup says that I am using more storage than list of computers

Norton Online backup - I've got 4 computers listed that add up to 8.5GB of saved files.  The bar at the top of the screen says that I am using 34.8 of 35GB.  How can I see what is there and how can I get rid of it?

 

One of the current computers is a laptop that had a new hard drive installed.  The only thing I can think of is that most came from the old hard drive, but I don't remember if it was using that much space or not.