Once it’s all cleaned up, the next you should do is backup your newly cleaned Mac. First, you should clean up your Mac from the old baggage - system files that have piled up over time. To clean install Mac OS from USB, there are three things you should do. So if you’re looking to give your Mac a fresh start with just a classic Mac OS X and nothing else, to clean install Mac OS from USB is the best option for you. There are so many things you can do with past OS X - like Lion, Mavericks or Yosemite - each one of these operates flawlessly. Those who still rely on older Mac OS X operating systems, know these still are going strong.
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