I am trying to clone my mac for the first time using SuperDuper! on its own partition on my WD My Passport 3.0 external drive from my 2012 Mini. When I first tried, it slowed to under 1mbps. I knew something was wrong, so I stopped it and updated the firmware. Once I was up and running again, I tried again. It started out great, around 130mbps, but within a minute, it was down to 4mbps. Now it's 2mbps. I only have 150gb or so in use, and no big files. Just basics like photos and songs. This is not right, correct? To make my first copy of Time Machine, it only took about 30 minutes on the same drive earlier this evening. Any help would be greatly appreciated.