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Message: [QUOTE="honestone, post: 1550762, member: 17069"] Cool! That "option" method is the simplest. As you basically stated, after you choose to restart your Mac from your most recent CCC backup on your external drive, the machine will be booted from there. As I'm sure you know, you can then use all the available software on your CCC backup, and I believe that is a High Sierra backup. Thus, by launching Disk Utility from there, it will be the "High Sierra" version, and thus you would Erase the new SSD, and format it as APFS. For the next step, as I mentioned, you have a choice: 1. Clean, new, "virgin" installation of OS 10.13.2. Then, a "migration"/copying of needed "stuff" from the CCC backup. 2. A complete restore from the CCC backup. Another thing, and I feel like a dunce! Given that your Mac Book Pro is a 2012 model, there is no way the Samsung SSD inside of it can be either and 850 Pro or an 850 EVO model. They did not make them at that time! I'm not even sure if it could be either and 840 Pro or 840 EVO model. I remember that when I installed the Samsung 840 Pro 256 gig SSD inside my Mac Mini, that was October 2013. Maybe the Samsung models at the time your Mac was assembled were either an 830 Pro or an 830 EVO (if they had such models then). [/QUOTE]