I often install alot of mods for my games, and found a really good way of backing up a "Already" modded game. In fact ive been doing it this way since the dvd writers came out. For instance I've got 4 different mod version games backups of SH2, where its just a mtter of copying to computer install the registry and modded game is ready.
Say you have SH3 modded just the way you like it, u got 20 + mods, skins, sounds etc., you got it perfect to your gameplay. Then back it up so if the sh*t hits the fan no worries. Providing you have a dvd writer, all you do is copy the whole SH3 folder onto a dvd, then go to "regedit" and copy the SH3 registry also to dvd. thats it. Then if you need to reinstall, just copy back the SH3 folder to exact place, so it should be C:\program files\ubisoft\silent hunter III, this is cos the registry you copied of SH3 registers as the game being in that folder, unless you installed SH3 somewhere else first time, then place it back to that one. Even if you dont install into the right place all you would need to do is edit the SH3 registry and directing it to the path where the game is now installed.
Double click on the registry to enable. Now throw in your Original SH3 dvd or cd and your ready to play your modded game.
Of course if your not lazy then your be the man and go install each mod at a time. :rotfl: