![]() Why? Well, your Mac might get slow due to system junk and other unneeded files. Back up your dataīefore backing up your data it’s always a good idea to clean your Mac first. Patience: Obviously, this process will take some time so you need to make sure you have an hour or two to spareĪfter making sure everything is ready, it’s time to prepare your Mac for the installation. ![]() For this reason, you need an external HD that is at least the same size as your Mac’s internal memory External hard drive (optional): You need to back up your data to save your important files before installing the new macOS.Make sure the installer is fully downloaded (about 5 GB) Good internet connection: You need to download the macOS High Sierra installer from the App Store. ![]()
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