Fragment of a discussion from Talk:BeagleBone Black Extracting eMMC contents
IN my case and probably others. I have created overlays for a custom cape. Added libraries, software, image etc. I documented it this time, but it took 2 hours to do it. Ok, I was side tracked some, but with cloning you turn it on and wait for the LEDs to stop blinking. Who cares if you get side tracked.