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: Use Time Machine or another method to back up your files before any major OS update.

: Connect your Mac to a power source to prevent interruptions during the installation. 3. Official Download Methods Method A: Using Software Update (Recommended) advertisement macOS Big Sur Free Download

If Big Sur is available for your Mac, click to begin the download. Method B: Via the Mac App Store : Use Time Machine or another method to

Select (or System Settings on newer versions). Click on Software Update . advertisement macOS Big Sur Free Download

If Big Sur doesn't show up in your settings, you can find it directly in the store. How To Install macOS Big Sur | Beginners Step by Step Guide

This is the simplest way to get the latest compatible version for your specific Mac.