How to test Mojave (10.14) – and how to revert to your previous version of MacOS

Apple announced the next major version of MacOS, MacOS 10.14, called Mojave, to be released on Sep 24. Who wouldn’t want to try it immediately? Of course risk-free, without jeopardizing production if you have just one Mac. You need a way to revert if not yet satisfied. Here’s how to safely test and how to quickly revert if needed.