![]() If you have backed up your Mac with Time Machine before you update to the current macOS, you can restore Mac to the previous macOS with the Time Machine backup. Install older macOS With a Time Machine backup In this way, you can get your files back after reinstalling macOS. You can choose to backup Mac with Time machine, upload important files to cloud storage, or transfer them to external storage. Thus, you'd better back up your Mac before wiping the drive. You need to completely erase your Mac startup disk before installing an earlier version of macOS or OS X with Time Machine or the Recovery mode.īear in mind that formatting Macintosh hard drive will erase all your contents on the Mac. Because you can not install an earlier version on the top of the current one. If you start to directly install macOS after downloading the installer, it won't succeed.
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