How can I uninstall yosemite?

I recently downloaded yosemite and hate the display. I am backing up my hard drive to a separate partition on my mac. It is name "Macintosh HD 2" and I was wondering if all my files will be safe on that? I plan to erase my hard drive so my system can go back to the original OS X. Will my files still be saved even though it is on the HD (on a separate partition)? Does anyone know if this works?
If not, how can I revert back to my original systems OS X?
I'm not very tech savvy so all information will help!
Thanks

It'll work when erasing the partition with Yosemite on it and installing the older OS, but not when the internal drive fails.
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