We show you how here: How to run macOS from an external hard drive. There are alternatives: If wiping your Mac sounds like too much hassle to you, you could try installing the alternate version of macOS on an external hard drive instead.Luckily you don’t have to wipe anything if you are just creating a volume. Be prepared to wipe everything: If you are in an older version of macOS when you partition your Mac you will have to completely wipe it! If you want to keep your current work, you need to create a backup of your Mac and ensure it will fit on your smaller partitioned drive.We also have this guide to using Time Machine, which is Apple’s software for backing up. We show you how to create a backup of your Mac here. It’s always wise to make sure you back up your Mac before you do anything like this, just in case it all goes horribly wrong. Back up: The next important step is to back up.Remove apps you don’t use (here’s how to delete apps), delete any files and folders you don’t need, copy your huge photo library onto an external drive, consider what you can delete from Other, system, cache, and so on.) Make some space: If you want to carve your Mac up so that you can run two versions of the OS you will need space.We will assume that you are running a more recent version of macOS so we will focus on creating a second volume, but we do cover how to create a partition separately.īefore you start, regardless of which version of macOS you are running, you should be aware of the following: On older versions of Mac OS X and macOS, you would have needed to partition your Mac, while in more modern versions of the Mac operating system you create a volume. There’s another point of confusion when it comes to dual booting. If you want to safely try out a beta version of the Mac operating system without committing to it (or risking it causing problems with the apps and data on your Mac).If you’re a software developer and need to test your own apps on different versions of macOS (particularly if you need to do this regularly).Creating a dual boot could be a good solution if you need to run those apps.
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