Why someone might want the installer DMG
To perform a clean installation or use the installer on multiple Macs, follow these steps: How to download and install macOS - Apple Support (PH) macos big sur 1121 installer dmg
Note for Apple Silicon Users: While Big Sur supports M1 Macs, creating and using bootable external USB installers relies heavily on the architecture of the host machine. Ensure you follow Apple's specific startup options guide (holding down the Power button on Apple Silicon vs. holding Option/Alt on Intel Macs) to boot successfully from an external source. Why someone might want the installer DMG To