For example, "Install macOS High Sierra.app" would become Install\ macOS\ High\ Sierra.app Be aware that any spaces will need to be preceded by a backslash. You can change various parts of this command to suit your own circumstances, with the main one being the name of the installer. This assumes that you're installing Big Sur, that your drive is labeled "macos_installer," and that you have the relevant macOS installer in your Applications folder: sudo /Applications/ Install\ macOS\ Big\ Sur.app/ Contents/Resources/createinstallmedia -volume /Volumes/macos_installer You can use a single command to create your installation medium, but this differs depending on which version of macOS you're trying to install. We'll be using Terminal to create the USB drive, so launch it via Spotlight or locate the app in your Applications > Utilities folder. We'd recommend test-driving any experimental macOS installations for a while before you commit. As a last resort, you could manually back up your important documents, libraries, and so on to an external drive. You can get around this by using a third-party backup tool like Carbon Copy Cloner or ChronoSync. For example, trying to restore a Time Machine backup made in Big Sur (released in 2020) in macOS Catalina (released in 2019) could prove difficult. Older versions of macOS might experience problems restoring from Time Machine backups made on subsequent releases.
If you do decide to try a new version of macOS and you're reliant on Time Machine for your backups, resist backing up with Time Machine until you're sure that it's where you want to stay. This guide can help you roll back to almost any version of macOS.
After trying this, you might come to the conclusion that newer releases perform too poorly on your hardware, at which point, you'll need to roll back. If you're willing, you can install newer versions of macOS than your Mac supports with tools like Patched Sur.
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