I added my first mods just yesterday and I had to load version 1.7.2 instead of 1.7.9 which is what I had. It asked me if I wanted to backup Minecraft before installing the mod. I did. Today I tried to download another mod, open blocks, but it was only compatible with 1.6.4. So I switched my minecraft to run 1.6.4. HUGE MISTAKE. Everything I'd built with the 1.7.2 mod is gone, and some of my vanilla stuff, stained glass etc. is gone also. I want to try to access my backup, but I'm not that good with computers as you can see. Is it possible to reload my minecraft game to before I added my mods? If so, how would I go about doing that?
I backed up my game before adding mods. How do I access that backup?