Auto Save - VBA Code or Excel option?

Is there a way to have excel automatically save the workbook every 5 minutes or so? I'm not talking about the backup option (tools-options-save) I mean do a hard save?

Or would this warrant a timed VBA code? If so, can someone build me one quickly? I'm kinda in a time crunch - sorry for last minute notice

Co-worker just deleted 8 hours of work bec "she didn't" know to save it....