You can't do this automatically, you need to run a script or a program.
You'd have to run the script each time you save the file though and pass it the file name as a variable. Even a simple DOS batch file will do it.
Copy %1 C:\blah\blah
Copy %1 D:\blah\blah
Run the file with the batch file name followed by the file name, move.bat somefile.jpg, it will replace the %1 with the file name passed to it.
There are programs that synch folders also if you don't want to run the batch file each time.
SyncToy is one http://www.microsoft.com/download/en/details.aspx?id=15155http://www.karenware.com/powertools/ptreplicator.asp