I am about to upgrade my Time Machine from 2TB to 4TB, and want to copy the current backup to the new drive. Currently only got USB 2 on my 5.1 Macpro. I estimate about 12 hours to copy with USB 2. Is Inatek a good USB 3 card to get, and I presume will be full speed. From what I have read USB 3 is about 4 times as fast!