[andrewas]

TO cover every mod technology that can possibly be used, you need to copy the .exe, the dialogue.tlk (the dialoguef.tlk for certain non-english versions), the chitin.key, the .bif files, the override folder, basicaly everything.

To cover weiDU mods, what you have is sufficient. Although, with weiDU mods, you shoudlnt need a snapshot at all, unless you break the game by installing a non-weiDU mod after a weiDU mod.