![]() Attach the bootable macOS Sierra installation drive to your Mac.Performing a clean installation will remove your Mac and you will lose any data that you do not save to an external volume Be sure to back up your important files, pictures, data, or whatever – don’t skip this. We recommend that you have a full Time Machine backup in addition to the manual backup from which you plan to restore the data manually. Make a backup of Time Machine before you begin.If you don’t know what you’re doing with a manual file backup or a clean MacOS Sierra installation, don’t proceed, you’ll lose all your Mac data. This is NOT the same as using and restoring Time Machine. Therefore, you must back up the data manually using the method you selected in advance. Wiping and starting clean is the whole thing here. Important Note: A clean install removes everything from your Mac and then installs macOS Sierra, there is nothing else on the Mac. Manual backup of personal files, data, photos and important data. ![]() ![]() MacOS compatible with macOS Sierra (see list of Sierra-compatible Macs here).A bootable macOS Sierra installation drive.
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