Norton Ghost 15.0.1.36526 How to delete backup

I don't think my initial backup with Norton Ghost went through exactly right, so I'd like to remove that backup and start from scratch.  How do I actually delete that backup?  I have not been able to do it through the Norton Ghost interface, and I read elsewhere that if I manually delete the current backup through Windows Explorer, I will permanently get error messages inside Norton Ghost.

 

My C drive with Windows 7, 64 bit OS is 1.36 TB is what I want to backup, and I want to do the backup on my Free Agent GoFlex Drive (I:) which is the same size.

 

I guess I could just delete manually anyway, and then uninstall and reinstall Norton Ghost,

Thanks for any help.