I'm running Mavericks on my SSD and have a test El Capitan running in a separate partition on an internal HDD. I also have a USB HDD with a CCC-built bootable clone of my Mavericks system on it. Once I'm comfortable (note I didn't say "happy") with El Capitan I'll want to move it from the HDD partition over to the main SSD setup. My plan is to boot into the USB HDD Mavericks (after a final topping-off of the backup), blow away the SSD partition using Disk Utility, and then use CCC to transfer the El Capitan installation from the HDD partition to the now-empty SSD partition. Has anyone done this, and is this how it works or am I missing some critical point?