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You cannot do a full disk restore from a Time Machine backup created in macOS Mojave or whatever macOS version you are downgrading from. If you don’t regularly backup via Time Machine and don’t have TM backup available for the macOS version you are downgrading to, once you downgrade you can only do a file restore for individual files and folders. Here’s an alternative way to perform a quick backup of your MacBook. We use Time Machine to perform our backups and it is really easy. Because the downgrade process includes erasing your Mac’s startup drive, it is imperative that you make a backup of all your Mac’s information. With a backup, you can still recover your data, no matter what. We back up our data just in case something goes wrong during the downgrade process. If you are using iCloud Drive to store documents or folders, make sure that they are synced appropriately so that you don’t end up losing any critical work in progress documents. Install macOS High Sierra or other macOS Versionsīackup your MacBook before macOS downgradeīefore attempting to downgrade from macOS Mojave, make sure to back up your Mac.Don’t feel comfortable with using Terminal?.Create a USB Bootable Installer for macOS.Backup your MacBook before macOS downgrade.