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DO NOT TOUCH ANYTHING and BE SURE THE COMPUTER IS PLUGGED IN!ġ2. drag the name of the hard drive holding Yosemite to the field labeled "destination"ġ1. select whatever the name of your backup external hard drive is (the one you're currently booted from) from the column on the left and drag it to the section labeled: "source"ĩ. Once you've copied everything over go to the magnifying glass in the top right of your screen and use it to search for "disk utility"Ĩ. now that you are booted into your backup copy over everything from the current state of your computer that is important to you/ you'd like to keep (if that is everything but the new operating system try simply dragging the newer version of your *insert your username here*'s folder to your older *insert your username's here*'s folder and if any of the files are already present they won't be copied twice)Ħ.
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boot your computer from your external HDD (it'll probably be the orange icon incase you aren't familiar)ĥ. Turn on your mac while holding the "option" key (this will allow you to select the drive your computer boots from)Ĥ.
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*This is a brief guide to copying everything new since the backup that you'd like to keep, excluding Yosemite obviously, then turning your macbook's hard drive into a clone of the external hard drive once the backup has been MANUALLY updated*ģ. Perhaps there is a way to actually perform a true "downgrade" from a technical standpoint, but if you're looking to simply move from Yosemite to Maverick and you already have Maverick on an external HDD, here's what I would do: