I was playing tekkit and i thought i would go back to the old 3.0.0 to get the crafting table 3. i opened it up and it opened vanilla. i was in a creative world so it was like a massive city. i used a lot of mod blocks and every thing that i viewed was taking away all the tekkit items away. i went back to the newest. it had the mods but the main part of my city was destroyed including a nuclear reactor and two towers. is it possible to get back old saves.