To make a bootable macOS Big Sur beta installer drive, you will need the following: Requirements for making a boot macOS Big Sur USB Install Drive If you’re interested in creating a macOS Big Sur bootable USB install drive, this tutorial will walk through that process.
Bootable MacOS installer USB drives provide for the ability to clean install macOS Big Sur, update to macOS Big Sur, install macOS Big Sur beta onto multiple Macs without redownloading the installer, as well as the ability to use Disk Utility to partition and erase a machine, perform Time Machine restorations, and more.