You should never publish your hubpage articles anywhere else. Even though you own the copyright on what you write and have the legal right to publish your article in as many places as you want, hubpages will penalize you for duplicate content. As a result, your articles on hubpages may be deleted or you may even get your account shut down. If you start a separate blog site make sure that the articles that you publish there are different than the ones you have on hubpages.
A good idea however is to use the articles that you post on your blog to link back to hubpages in order to increase traffic as well as your ranking in the search engines.