Excel Spreedsheet Lost????

I a user working on an excel spreedsheet this morning and when he went to save it the system locked up. The only thing we could do was reset the PC. This spreedsheed was being saved to a local server. Is there any place that it could have saved a copy of the spreedsheet.

I know if you are doing it locally you can some times get away with going back to it. Is there any way to do that over the network? I know I am probably reaching here.