You’ll need to enter a command, which will differ based on the macOS version you’re using. Plug in your formatted external hard drive and launch the Terminal app. You’ll need to follow these steps on the machine that has the installer for the older macOS version. Click Erase, then Done once the process completes.The best Mac file system to choose depends on what you plan to use it for. Under Format, choose either the HFS+ or APFS file system.Under External in the list on the left, select your disk and then click the Erase button at the top of the window.You can find this with Spotlight ( Cmd + Space) or by going to the Applications folder in Finder, then opening the Utilities menu and double-clicking on the app. But remember that your drive needs to be formatted to a compatible file system such as HFS+ or APFS. If your drive is already formatted, you can skip this section. Prepare the External Driveīefore you can create the installer, you need to format the drive. The next time you upgrade, you might want to make a backup of the previous version’s installer, just in case.įor this process, you’ll need a 16GB or larger USB flash drive or external hard drive. Moving forward, it’s worth remembering that older macOS versions are now harder to download. Follow the prompts to complete the reinstallation, then restore your files from the backup you created. You’ll be able to see which version of macOS was used to create that backup. On the following screen, select the backup you want to restore from.In this case, that’s the backup drive you plugged in earlier. On the next screen, click Continue again.
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