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saving bootable yosemite to external drive

  1. carizma22

    Update Safely from Yosemite to High Sierra?

    I have a 2015 Macbook Air 11" running Yosemite. Because of unstable Internet at home, I have not tried to update to a more recent version of the OS. I have now discovered the joy of free Internet at coffee shops and libraries. So, my questions are should I update? What issues might I encounter...