I thought it would be nice to do this automatically, scheduled by windows task scheduler.
The manual method I use is: Log-in and have both directories on screen. From the commands menu choose Synchronize. Select "local", "mirror" and nothing ticked in comparison data (I have my reasons!). This achieves the result I want every time.
I'd be most grateful if someone could give me a partial script as a starting point, or point me in the right direction to achieve the same result.