Downgrading OS X version from Mavericks to last OS upgrade? I had an Application I used a lot with kids in my family that ran on the Power PC Mac. It was an interactive Alphabet program by the Learning Company with talking cartoon Characters.  2 through 5 year olds loved it. It was based on a 
Dr. Seuss's Book about the ABC's. Every letter was covered. The child could spend large amounts of time exploring each letter and little talking animations would come up. I upgraded my Mac laptop to Mavericks. Now the program will not work and there never was an upgrade of the program. How can I undo Mavericks and go back to the way my Mac used to be? I want that Power PC program back worse than an upgraded Mac.  Find me an ABC Program that Surpasses this Dr. Seuss program and I might reconsider downgrading. Can you please help me?
The last Mac OS which supported Power PC emulator (Rosetta) on x86 was Snow Leopard. You can back up your data using Time Machine, find distributive on your CD and install it.

UPDATE

As people said, you should copy your data directly without using Time Machine.