Nortons Backup Drive?

I just installed a WD External drive on my computer. I was using Norton's Backup, but run out of space. I would like to know how I can get rid of the Nortons Backup Drive in "my computer"? If I uninstall Norton 360, will I mess up anything.Norton is tricky about letting go of anything. I'm wondering if I could uninstall 360 and then reinstall it and drop the Back Up.I still have some time left on my installation and then I'm thinking of using something else.
Could someone give me some advice about getting out of Norton without doing any damage? Thank You in advance for your help.
Red