I have an old Macbook Pro, Snow Leopard, and want to back up using Time Machine wirelessly on an external HD. Tried Time Capsule and was too complicated, visited the Genius Bar at an Apple Store, they referred me to Applecare to do a ridiculous configuration. I have an old external HD which works fine using wired connection to back up but want to go wireless. I have no router of any kind, and am an extreme novice.