Loading of an old version

Hi,

I play on my Xbox One in a world with a friend and one day, because of my connexion, my world has badly loaded. I left, and I think it crushed the version of my world. Now my world is doing 12.6 MO while is was doing 60 MO.

I have hours of lost game.

I don't know how to get the right version of my world.

Thanks to you