SuperDuper works great to make a bootable backup drive. They have a free version and a paid version. I used SuperDuper when I upgraded my Imac hard drive, by making a bootable exact clone on a spare laptop drive. I have used this drive to boot other machines under test. I have not tested it on a Bootcamp but for Mac partitions it is much better than Carbon Copy Cloner.
As usual, a great teardown. Thanks. The Mac Pro is an amazing piece of engineering, Apple did a great job, a work of art. Really nice, only Apple. You don't see hardware like this from other computer makers. I did not see a picture of the flex cables that have the big 300 pin connectors in any of the pictures. I would have thought they would have at least been in the last picture.