For all my previous MacBook (Air and Pro) with Maverick, I always backed it up using Carbon Copy Cloner (CCC). For those who doesn't know, CCC can create a bootable image of your Mac. So you can take the external drive, plug it is into any Mac, boot up and VOILA! You got your machine right there. Much better than Time Machine. Anyways, I tried to do an image on my MacBook Pro Retina 2014 with Yosemite and this is what I found out: 1). USB 3.0 Very, very slow. I cannot get more than 40 MB Read / Write. Tested with major flash drive proven to have high speed: - 256 GB PNY USB 3.0 Turbo Flash Drive (4.5 stars - 1200 reviews in Amazon). Other reviewers (see the Amazon URL) got 180 MBps Read and 80 Mbps Write. - 64 GB SanDisk UltraFit USB 3.0 (4 stars - 200 reviews) And this brings me to the next problem... 2). Cloning I can clone my new MBP with Yosemite as usual, but then booting up from the flash drive is SUPER SLOW, like this: - Apple icon shown with progress bar --> 10 minutes - Login screen shown - click on the Password box --> beachball for 5 minutes - Got to desktop --> beachball for 5 minutes ... you got the idea With Maverick, all the cloned image boot up fast and is usable, as if I the image is installed in the internal hard drive. I tried both SuperDuper and Carbon Copy Cloner - same exact results. So my questions: 1). Is the slow USB 3.0 speed a common problem or my MBP just have bad ports (both of them?)? 2). Any idea about the cloning issue? I am leaning towards Yosemite OS as the main culprint, since Maverick works OK, but want to get the expert opinion.