I have some video files on an external HD from my old computer with iMovie 08. On my new iMac with iMovie 09, I have opened up one of those video files, or imported it. My question is this: Is there any need to keep the original file from my old computer, or has it now been stored on my new one with iMove 09? I'm thinking if I keep the old one, I am storing it twice. I am backing up my iMac, so that's not an issue. I'm just trying to figure out if I am keeping a "third" copy when it's not really needed.