I just purchased a LaCie Thunderbolt drive and want to use it with Time Machine along with my current Time Capsule. When I set this up in the Time Machine preferences it says that Time Machine will take turns backing up to each drive. I have 2 questions about this: 1.) Will Time Machine do an official "initial backup" to my LaCie drive or just and intermittent back up that would typically happen on my Time Capsule? 2.) What if it's the LaCie drive's turn for back up but it's not connected to my Mac? Will the back up fail or will it default back to my Time Capsule?