I plan to buy the new MacBook Pro being announced in October. However, I have to trade in my current MacBook Pro NOW in order to get the best trade-in price. So.... I need to back up my current MacBook Pro to an external hard drive. I need to do it in a way that when I get my new 2016 MacBook Pro that I can do a MIGRATION off of that external hard drive. I can use something like SuperDuper! which basically clones your hard drive to an external. I am just not certain that MIGRATION on the new MacBook Pro will port over everything from a SuperDuper copied external drive. Would appreciate advice. Thanks.