Last night, I started to back up and carbon copy clone a 1TB 7200 rpm hard drive (my photos drive) to another 7200rpm 1TB hard drive via a eSATA dock and I'm amazed it takes 17 hours and counting to clone the 900gb of data(photos) on my Mac Pro 5,1. I wonder what the next advancement will be to improve data copy speeds? It seems like a lot of time when dealing with such large quantities of data. It works out to 51 gb per hour? Are these typical speeds? I'm suspecting yes.