And trust us, you’ll sleep better having done it. Note that when Yosemite is released this autumn, you can just delete the partition to get the space back on your Mac’s main drive. OS X Yosemite makes use of iCloud Keychain, a system of storing encrypted. You can then select it during the Yosemite install, and boot to it from Startup Disk in System Preferences or by holding Option (Alt) when restarting. A recent Time Machine backup is the bare minimum you should have on hand. Once you’re done, click Apply and your drive will be non-destructively partitioned. Select the second partition and drag the separator until its size is however much you want for Yosemite – Apple says 8GB minimum, but we’d say you need at least 20GB to test it properly. In Disk Utility, select your drive, click Partition, and click the + button.
(Note: if you have a Fusion Drive, don’t follow this process – this is only a straightforward option if you’re using a standard HDD or SDD.) The download is free and takes about an hour to finish, depending on your Internet. Alternatively, if your Mac’s drive still has plenty of spare storage space, you can create a separate partition for Yosemite. Installing Yosemite Once your machine is all backed up, you are ready to download Yosemite from the App Store. OS X can be installed on to an external drive (although unless it’s got a fast connection, the result may be sluggish). On the top next to the search bar, you will find your registered name. Select System Preferences from the submenu. Then use data from cloud services (iCloud, Dropbox, and so on) with Yosemite, meaning that will also be accessible to your main OS X install. How to back up MacBook: Click on the Apple menu located in the upper left corner of your Mac screen. If you just want to muck about with Yosemite rather than use it daily, there’s another option: install Yosemite somewhere else.
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