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You can do all of this using standard options. This will allow you to then boot from the USB drive and make it possible for you to unmount your computer’s internal drive, format it and install Yosemite on it from the USB drive. Use the new Recovery Tool from your updated Mac to install Yosemite on a USB drive. The strategy is to upgrade the OS on your computer as intended by Apple through the App Store. My Mac is constantly being backed up to a NAS device, hence I take this for granted, but this is an important step. Important: Backup all the data that you need.Make sure you have a fast and, more importantly, a reliable internet connection.Make sure your Mac is connected to a power source.
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