There is an alternate approach to this, if you're making Time Machine backups. Clone current drive to external USB drive, download new macOS installer from Mac App Store, create new bootable USB installer, upgrade software. I download the macOS Installer once, install on each system. I have two Macs, so it is handy to have the bootable USB installer thumb drive. Use your favorite search engine to look for "mac OS High Sierra bootable USB." There will be a number of online articles that explain how to create and use a bootable USB thumb drive with the High Sierra installation instructions. Just leave it in the Applications folder and go home.Īcquire an 8GB USB thumb drive or an 8GB SD card and appropriate card reader. Set aside.ĭownload the macOS High Sierra Installer from the Mac App Store at whatever location has decent Internet, but do not run the installer. Boot from the external USB drive to verify that the copy is functional. Use Carbon Copy Cloner and clone your Mac's drive running Yosemite. First of all, you should be making regular backups (with Time Machine or another archiving utility) on a regular basis, regardless whether or not you will be imminently upgrading your computer's operating system.Īcquire an external USB drive that is the same size or a little larger than your Mac's drive.
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