My Tekkit server has taken apart my mountain and put parts of it elsewhere

[Smurf_Hunter1945]

I have just logged on to my personal Tekkit server that i share with my brother and a friend to find that the mountain outside my house has a massive chunk missing which has been placed through my house, erasing everything i owned within and replacing it with stone, also a chunk of the ground has been placed a little further away. Does anyone know how to reverse this as for some reason there are no previous versions to restore it to before it happened