![]() Wait for the Time Machine backup to complete before continuing with the macOS High Sierra installation.įollow these instructions to install the macOS High Sierra update on your Mac. A progress bar will appear in the Time Machine system preference pane.If not, open System Preferences > Time Machine and click Select Backup Disk.An alert may appear asking if you want to use the drive to backup your Mac. ![]() Choose a new hard drive, or one that you don't mind erasing.
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