How to Clean Install macOS Big Sur from a USB

If you're looking to perform a clean install of macOS Big Sur on your Mac, this article will guide you through the process using a bootable USB installer.

'Clean install macos from usb'

The first step is to manually download macOS Big Sur 11 from the App Store and then create a bootable USB installer. This will allow you to bypass the upgrade option in Software Update if it's not available.

To start, click Continue after opening the macOS Big Sur installer. Follow the on-screen instructions to install macOS Big Sur.

Once the installation is complete, restore your data from a Time Machine backup to ensure that all of your important files and settings are preserved.

Step-by-Step Instructions for Backing Up Your Mac

Before you begin the clean install process, it's essential to back up your Mac start-up disk. Here's how:

1. Ensure that your Time Machine backup drive is connected to your Mac.

2. Go to Menu bar > Time Machine > Back Up Now.

3. Wait until the Time Machine backs up your Mac to the external backup drive.

Why Use Time Machine for Backing Up Your Mac?

To prevent data loss due to the Big Sur upgrade, it's crucial to back up your Mac using the native backup and restoration application: Time Machine. This ensures that all of your valuable files and settings are safely stored in case anything goes wrong during the installation process.

What's New in macOS Big Sur?

macOS Big Sur 11 features a rehashed Safari, Messaging, App Store, Notes, Photos, and Maps. It also brings forth major user interface redesign and is the first macOS version to support ARM-based processors. Apple released macOS Big Sur on November 12, 2020, replacing macOS Catalina 10.15.

By following these steps and using a bootable USB installer, you can perform a clean install of macOS Big Sur safely without losing any of your valuable data.