I lost my career save, is there any way I can get it back?

[DragosBox]

I have been playing a manager career for over a month now and last weekend when I went in the game, the save was not there. I think it might be because I am playing another career at the same time. My question is if there is any way I get the save back and if it is, how can I stop this to happen again. Thanks is advance.