Scared to update to Yosemite, If it doesn't work can you get everything back?

I am currently on 10.6.8. I wanted to update to Yosemite but I am scared to because I do not want to lose all of my files. Is there anyway if it doesn't work and freezes that I can get all of my files back and 10.6.8 back? And if you can get them back, How? I am not that good with technology and I don't want to mess the computer up. Thanks for all of the help, Carl.

You will need to do a good backup (I'd suggest getting the trial of carbon copy cloner, and cloning, not copying, your entire system to an external drive.) If you simply upgrade over the top of your current system, you are likely to find a mass of incompatible apps, which will need upgrading.
I'd suggest the best thing to do is the following
a) do the backup (do it anyway, you dont want to lose your files for any reason, never mind upgrading the OS)
b) check that your hardware is compatible with Yosemite (http://osxdaily.com/2014/06/03/os-x-yosemite-system-requirements-compatible-macs -list/ will tell you)
c) IF its compatible and after you have made a clone or copy of your current system (even Time Machine would be a better option than nothing at all) you should do a CLEAN install of Yosemite.
d) If the install goes OK and everything looks like its working the way it should, you could migrate your files and info from your clone or time machine.
And cross your fingers.

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