First, you need to enable Volume Shadow Service and make sure it is running.  Next, you have to install Windows Resource Toolkit (Windows 2003).

Here is the command you need to run:

robocopy E:yourlocalfolder R:destinationfolder /MIR

/MIR mirrors the 2 folders.

To run as a Scheduled Task, in the Run window, type the command above.  In the Start in window, type “C:Program FilesWindows Resource KitsTools”

Make sure you run this with an account with administrator privileges.