Gurus, I've got the Yosemite installer, DiskmakerX and a USB drive to put it on. I've also got a Time Capsule that my MBP backs up to, but I want to know about maybe using something like Carbon Copy Cloner to create a bootable clone drive. Does it need an 'empty' drive, or can I specify a folder on a drive I already have? Failing that, what other options do I have? Cheers.