I'm considering upgrading system to El Capitan, but I have a lot of apps that could not work on new system. I have to check it by installing new system. I wonder if that apps would not work properly could I revert system to Yosemite by using TimeMachine backup, after upgrading system to El Capitan? Or it'll revert only files but on new system version?
How does it work?
It's critical for me, because I'm working on this apps. If I wouldn't be able to run them I'm dead.