![]() ![]() Create your bootable installer from this app, not from the disk image, and follow the instructions as stated above. This process installs an app named Install OS X El Capitan into your Applications folder. After you download El Capitan, open the disk image and run its installer, which is called InstallMacOSX.pkg. Type or paste one of the commands below into Terminal, then press Return to enter the command. Open Terminal, which is in the Utilities folder of your Applications folder. Plug in the USB flash drive or other volume that you're using for the bootable installer. The only difference is that El Capitan downloads as a disk image. Use Terminal to create the bootable installer. When downloading El Capitan, the process is much the same. ![]() Catalina, Mojave, and High Sierra # El Capitan # The process differs slightly for different versions. The next step is to download the operating system for which you want to make a backup and move it to your USB drive. If it’s not already in the right format, here’s how to format your USB flash drive: Download macOS # ![]() Make sure whatever USB drive you select is formatted as Mac OS Extended. If your budget allows, a flash drive larger than 16 GB certainly won’t hurt. A 16 GB flash drive is big enough to install a complete copy of the macOS along with recovery utilities, such as Data Rescue, Drive Genius, and TechTool Pro, that you’d find helpful in an emergency bootup situation. Apple recommends using at least a 12 GB flash drive as a bootable installer, but a 16 GB flash drive might be worth the extra money. ![]()
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