macOS Big Sur elevates the most advanced desktop operating system in the world to a new level of power and beauty. Experience Mac to the fullest with a refined new design. Enjoy the biggest Safari update ever. Discover new features for Maps and Messages. And get even more transparency around your privacy.
Check compatibility
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macOS Big Sur is compatible with these computers:
MacBook introduced in 2015 or later
MacBook Air introduced in 2013 or later
MacBook Pro introduced in late 2013 or later
Mac mini introduced in 2014 or later
iMac introduced in 2014 or later
iMac Pro
Mac Pro introduced in 2013 or later
View the complete list of compatible computers.
If upgrading from macOS Sierra or later, macOS Big Sur requires 35.5GB of available storage to upgrade. If upgrading from an earlier release, macOS Big Sur requires up to 44.5GB of available storage. To upgrade from OS X Mountain Lion, first upgrade to OS X El Capitan, then upgrade to macOS Big Sur.
Make a backup
Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
Get connected
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It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.
Download macOS Big Sur
If you're using macOS Mojave or later, get macOS Big Sur via Software Update: Choose Apple menu > System Preferences, then click Software Update.
Or use this link to open the macOS Big Sur page on the App Store: Get macOS Big Sur. Then click the Get button or iCloud download icon.
Begin installation
After downloading, the installer opens automatically.
Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.
Allow installation to complete
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.
Stay up to date
After installing macOS Big Sur, you will be notified when updates to macOS Big Sur are available. You can also use Software Update to check for updates: Choose Apple menu > System Preferences, then click Software Update.
Or get macOS Big Sur automatically
If you're using OS X El Capitan v10.11.5 or later and your App Store preferences or Software Update preferences are set to download new updates when available, macOS Big Sur will download conveniently in the background, making it even easier to upgrade. A notification will inform you when macOS Big Sur is ready to be installed. Click Install to get started, or dismiss the notification to install later. When you're ready to install, just open the file named Install macOS Big Sur from your Applications folder.
Learn more
- If the installer shows a list of apps that are not optimized for your Mac, learn about 32-bit app compatibility, then choose whether to proceed with the installation.
- For the strongest security and latest features, upgrade to macOS Big Sur. If you have hardware or software that isn't compatible with Big Sur, you might be able to install an earlier macOS.
- You can also use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS, or install the macOS that came with your Mac.
Best apps live in Setapp
A free public version of macOS Big Sur 11 has been available since November 12, 2020. It offers the best Safari we’ve ever seen, a huge design upgrade, and one very neat Control Center. Ready to dive in? Let’s see how you can do it.
There are two ways to install a new macOS: 1) run a regular upgrade via Apple’s main menu (replace your current macOS with Big Sur on your startup drive); 2) start from scratch and clean install macOS. Option number 2 is a bit more cumbersome and takes more time — but there are many benefits to it. In this article, we explain how to clean install macOS Big Sur without any trouble and why it’s good for your Mac.
Why you should clean install macOS 11
As soon as the new macOS appears, we can’t wait to try it. With Apple promising lots of awesome enhancements, it’s hard to resist the temptation. So it’s no wonder people tend to rush things and choose the quickest way to upgrade macOS — the regular install. Not only is it faster, it also allows you to maintain all your saved settings, apps, and files on a new system. But is it really something your Mac wants?
Speaking in defense of clean install, here’s how it benefits your Mac:
- You get rid of the unnecessary clutter and old system bugs
- Your Mac will run faster — as if you’ve just recently unboxed it
- Uninstall software you never use
- Fix common problems like Mac slowing down, freezing, etc.
Generally, installing a new macOS Big Sur on a clean drive will give your Mac enough space to breathe. You’ll be less likely to experience common Big Sur problems and you’ll get a chance to keep only the data you really need. It’s like you bring the new furniture in an empty apartment instead of a cluttered one.
macOS 11 compatible Macs
Before you take any steps to switch to Big Sur, make sure you check compatibility. With the release of macOS 11, Apple moved a year or two ahead in terms of supported devices, so the chances are your Mac might be off the list (ouch). Here are the Macs that support Big Sur:
- MacBook (2015 or later)
- MacBook Air (2013 or later)
- MacBook Pro (2013 or later)
- Mac Pro (2013 or later)
- Mac Mini (2014 or later)
- iMac (2014 or later)
- iMac Pro (2017 or later).
Not sure which model you have? You can easily check it by clicking on the Apple icon > About This Mac. You’ll find the information you’re looking for in the Overview section.
Steps to clean install Big Sur
Once you’ve decided to start anew with macOS Big Sur, you’re only six steps from achieving your goal. Make sure you follow all of the steps and have a safe experience.
Step 1: Remove all the junk
When we say that clean installation removes everything from your Mac, we forget one important detail — a backup. If you back up your Mac before upgrading, you’ll be able to restore all your files on the new macOS (and with it all the clutter your old system contained.) You want the files back, but you don’t want the clutter. So the first step should be a thorough cleanup of your system.
No worries, it only sounds intimidating. Apps like CleanMyMac X allow you to remove all the clutter — from old caches to file duplicates — in one click. Here’s how to get ready for your Mac backup:
Open CleanMyMac X > Smart Scan
Wait a few seconds for CleanMyMac X to finish the scan
View the unneeded files detected by CleanMyMac X and click Remove.
You can also choose to remove system junk only (find the option in the Cleanup section). This will delete most of the redundant files and let you reclaim lots of storage space. Still, a smart scan cleanup will do a better job while it can also detect potential malware and provide insights into your Mac’s performance. So if you have a couple of minutes, spend it on Smart Scan.
Step 2: Create a secure backup of your Mac
Many people use Apple’s native Time Machine to back up their files, but we don’t recommend it. Users report Time Machine tends to carry over macOS issues into new installations. What’s more, Time Machine can’t do bootable backups, which means you’ll have to go through a long restoration process in case there’s a drive crash or an error of any kind.
Get Backup Pro is a third-party backup utility that makes sure you run zero risks when you clean install Big Sur. And not only Big Sur. It’s generally the best alternative to Time Machine we’ve seen so far. Get Backup Pro allows you to create both backups and bootable clones so you can easily take your data to a replacement drive in case something goes wrong. Plus, you get great features like compression, backup scheduling, and the ability to choose specific files for a backup.
Here’s how to back up your Mac before the Big Sur upgrade:
- Open Get Backup Pro and select Backup in the sidebar
- Click on the plus button to create your backup project
- Customize destination (make sure you save your backup to an external drive)
- Add files and apps data to your backup by clicking on the plus button
- Hit the Backup button (it looks like the Play button) to start the process.
Step 3: Download the Big Sur installer
Starting November 12, you’ll be able to access the Big Sur installer in the Apple menu > About This Mac > Software update. Alternatively, you can download the installer from the Mac App Store. It’s free and effortless.
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But be careful, it’s important to not rush things here. Your goal is to save the installer to your Applications folder and not to go through the installation process. So if the installer automatically launches, don’t click Continue. Close the window by clicking on “Quit install.” You’ll use the installer later when you clean install macOS.
Step 4: Create a bootable USB installer
Prepare a flash drive USB with at least 16GB of free storage. Connect it to your Mac and start creating a bootable USB installer. First, you’ll need to erase everything from your drive:
- Access Disk Utility on your Mac
- Select your drive from the list of internal drives and click Erase
- Set the format to Mac OS Extended
- Confirm that you want to erase the drive.
Next step, open Terminal and enter the following command:
sudo /Applications/Install macOS Big Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled
Remember, “Untitled” is the name of your connected drive. If you name it differently, make sure you replace the name in the Terminal command.
Press Return and Y. You might need to type your admin password to confirm your action. Once the process is complete, click Done and close Terminal. That’s it. You just created a bootable USB installer that’s based on the Big Sur installer you had downloaded before.
Step 5: Erase your startup drive
Time to say goodbye to your old macOS. Erase your startup drive fearlessly — you have your most important files securely backed up. Here are the three steps:
- Shut down your Mac and hold down Command + R to enter the Recovery Mode
- Access Disk Utility and select your main startup drive
- Click Erase in the menu and confirm your action.
Step 6: Clean install macOS 11 Big Sur
Finally, here’s how to do a clean install of macOS using your USB installer drive:
- Restart your computer and hold down Option
- Go back to the initial screen of Disk Utility
- Choose to install macOS from the connected USB drive
- Click on Install macOS to confirm your action. Breathe out. And go celebrate!
How to reinstall macOS Big Sur
If you’re not ready to go celebrate because the installation didn’t work, you can try to reinstall Big Sur. All you have to do is restart your Mac and boot in Recovery Mode (Command + R), then click on Reinstall macOS. Hopefully, it works this time.
How to run a regular macOS update
If you don’t want to clean install Big Sur just yet, you can place the new update on top of your current drive, which will preserve all the settings. If your Mac runs on OS X Mavericks or later, you can update directly to Big Sur. Note that Apple recommends you have around 35.5GB available storage and 4GB of memory on your macOS before upgrading. This will be easy to achieve by removing unnecessary files with CleanMyMac X.
Also, even if you run a regular update, do make sure you back up all your data with the Get Backup Pro app. Some might call it an unnecessary precaution. We call it a one-click process that will keep your files safe under any circumstances.
Here’s how to run a standard macOS Big Sur installation:
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- Click on the Apple icon in your menu bar > About This Mac
- In the Overview section, click on Software Update
- Click on Update Now to download the installer
- Follow the installation instructions on your screen.
macOS clean install safety toolkit
Setapp has CleanMyMac X, Get Backup Pro, and 200+ other top-notch apps that will support your Mac on its way to Big Sur. So if you have the Setapp membership, no need to worry, you’re safe. Even more, Setapp has Disk Drill, a popular data recovery tool — just in case the impossible happens and you lose your data switching to the new macOS. The whole suite of apps in Setapp is free for 7 days, then $9.99/month. Give it a try!
Meantime, prepare for all the awesome things you can do with Setapp.
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