Norton Ghost 15 newbie

I upgraded to NG15 SP1 after getting this program about a year ago with Windows 7.  There has been a learning curve compared to Norton 9.  I used to overwrite my old file with N9, but I don't see anywhere to do that with 15.  It will run for a long time (60 min.?), then say "there is not enough room on your drive" or something like that.  I am using a 250 GB external HD and have less than half that on my PC.

 

My second problem is that after a while my screen goes black (power options I'm sure) and I can't see the progress that is being made.  Does everyone turn off their power options when Ghosting?

 

So my 2 questions are:

1.  How do you overwrite your old file

2.  How do you see what is happening with the Ghosting?