Our advice would be to be absolutely sure that everything you need is in the cloud before you wipe you Mac though–in these days where we are so accustomed to everything being in the cloud we can forget about the things that aren’t. If, like us, you use iCloud you may find that a lot of what you need is actually in the cloud rather than on your Mac. We discuss the best ways to back up a Mac separately. We have some suggestions for back up options here: Best back up software for Mac, but you could just copy files, folders, photos and music onto a external drive. So you would just reinstall the version of macOS you are trying to revert from.įor that reason you want to make a back up of your data that won’t preserve the operating system. Normally our advice would be to use Time Machine to back up your Mac, but the problem with that method is that Time Machine makes a complete back up including your operating system. You will therefore need to make a back up of anything you don’t want to lose. Most of the processes for reverting to an older version of macOS unfortunately mean you will need to wipe your Mac. We have a separate article about installing a new macOS on an older Mac. This is because newer versions of macOS tend to drop support for older Macs. Similarly, if you were hoping to install newer version of macOS on an old Mac you might find that you can’t. If you are installing an old version of Mac OS X on an old Mac you shouldn’t have too many difficulties though. To help you find out what versions of macOS your Mac supports we have a full list of which Macs run each version of Mac OS X and macOS. However there may be exceptions, for example, if you bought a Mac in 2017, but the spec hadn’t changed from the predecessor, or the model was actually introduced a few years earlier, you may find you can run an older version of macOS on it. If you want to run older versions of OS X on your Mac, you need to get an older Mac that can run them. Simply speaking, Macs cannot boot into an OS X version older than the one they shipped with when new, even if it’s installed in a virtual machine. You may find you can’t install an old version of Mac OS X on a new Mac because the drivers for the hardware in your new Mac simply don’t exist in the old software, so it can’t run. Now for the bad news: It is unlikely that your Mac will be able to run a version of macOS or Mac OS X that is older than the one that was installed on it when you bought it. Remember, you'll need to pay $100 (about £69, AU$140) to enroll.First you need to confirm that your Mac will be able to run the version of macOS or Mac OS X you want to install.Īs a guide, expect your Mac to be able to run any version of macOS or Mac OS X that was supported when that Mac launched, and any that were released in the few years immediately following your purchase. Click the 'Start Your Enrollment' to begin and then follow the instructions. You'll need an Apple ID, and provide your basic personal information. If you’re not currently enrolled, then go to the Apple Developer Program enrollment webpage, which will show you everything you need to sign up. To do that, you need to be enrolled in the Apple Developer Program. Once you've downloaded macOS 11 Big Sur, you might want to play with the more cutting edge developments in the OS that aren't available to the public yet. How to enroll in the Apple Developer Program For information on how to do this, head over to our ultimate guide to backing up your Mac. Whenever you upgrade your operating system we highly recommend backing up the files on your Mac, so if anything goes wrong you can quickly restore your machine to its previous working order.īefore you download and install macOS 11 Big Sur, make sure your Mac is backed up. (Image credit: Apple) Back up your Mac before upgrading to macOS 11 Big Sur
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