Originally Posted By: kevs
What happens? You double click "install El Capitan from the clone, and it knows to install on the other drive - the just erased Mac HD?



No. After double clicking on it (and going through a couple of screens), the startup disk on your Mac shows up. But, there is a button entitled "More disks" that one would click, and it will show all drives attached to the Mac. So, IF you want to install it somewhere else besides your Mac's startup disk, you would select it.

But, in this case (given that one wants to install it on the Mac's startup drive), you can just continue with the installation. Real simple!