Just want to clear something up. I am a member of a server which runs MC on v1.5, but I currently have 1.4.7 installed so I can play FTB. If I upgrade my vanilla Minecraft, will FTB no longer work? If that's the case, I assume I can just make a backup of my minecraft.jar file for each version and replace them when I want to switch between FTB and vanilla. Will that work?