Any way to hide or remove (with out double twist ejecting the resource from the computer) an iTunes folder from DoubleTwist?

example - I have a time machine backup disk attached to my Mac via USB, and Doubletwist indexes that drive and it is confusing to have two iTunes, photos etc folders or options in DoubleTwist. I did go into resources and tagged DoubleTwist to only look at my local copy of iTunes but it still pulls both? I'm thinking of getting an Android phone and this is whats holding me up...