Continuously copy all file changes from one folder to another on change (Windows)

I suggest FreeFileSync, which appears to have the ability to create a script that will automatically sync the two folders every few seconds. I haven't played with it personally, but it looks promising.

Have you considered using RoboCopy? http://ss64.com/nt/robocopy.html

RoboCopy can be set to copy the data after a set period of time has elapsed and/or a number of changes to the datasets have occured.

/MON:n : MONitor source; run again when more than n changes seen.
/MOT:m : MOnitor source; run again in m minutes Time, if changed.