I just ordered two Buffalo Thunderbolt USB 3 drives. One for me and the other for the wife. They are 500GB and seem to be on close out for $138 at Staples. The Buffalo units come with a Thunderbolt cable. Thunderbolt cables alone can cost dollars. With Samsung 840 EVO 1TB SSDs now below $500, I can put an 840 EVO 1TB SSD into the Buffalo enclosure and have a mobile 1TB SSD with Thunderbolt cable for less than $600. Compare that to the Elgato Thunderbolt SSDs which are in the $879 range for a 512GB size. This Buffalo Samsung combo should make for a highly mobile and fast backup for MacBooks that have internal SSDs up to 1TB. The 512GB drives I take out of the Buffalo enclosures will be given to friends for their computers.