Return to your previous system in seconds

Once the beta is installed, you’ll continue to receive updates to it right through to the general public release. If you’ve followed our method of trying out the beta on a second drive, either as a clean installation or over the top of a clone of your working system, you can switch back to your previous version of macOS or OS X by choosing it in System Preferences’ Startup Disk pane. But if you used Apple’s method of making a Time Machine backup, you‘ll need to follow Apple’s guide for Sierra at bit.ly/rstrtimemac or the one for your system at bit.ly/rstroldersys.