DFS
http://en.wikipedia.org/wiki/Distrib...tem_(Microsoft)
Or you could just write a script that copies the file from one hidden network share to another and make it a scheduled task. Create a domain user (no expire password) that has access to the source and destination, then just batch an xcopy command and make that the user who runs the task is the one you created for said purpose. It's what I do for our Password Safe. I don't trust DFS that much. Too many things can go wrong.