If you're happy with how the new OS was working on the external test device, you can proceed to install it onto your Mac's production startup volume. You can then erase the new external disk and use it for some other purpose. When you're done testing, reset the startup disk to your Mac's internal disk and reboot. When the installation is complete, your Mac will boot from the external disk automatically, and all of your user data and applications will be "adopted" by the new OS. ![]()
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