You’ll get beta versions of Big Sur updates when they become available. What happens after the final version ships? How to restore your system if you want to reformat your Mac and start over from scratch. You’ll need to use a Time Machine backup to restore your system back to the OS before Big Sur was installed. If you try out the beta and decide later that you don’t want to use it anymore and want to go back to macOS Catalina, Apple has instructions on Which Macs are compatible with macOS Big Sur? The macOS Public Beta Access Utility checks to see if you’ve made a Time Machine backup of your Mac.
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