I setup a simple project that would look at our documentation SVN Repository and on change copy to to C:\buildtest on my local machine.
I then modified "test.txt" in that repository and it triggered the build as expected!
It did not copy of the files as expected, I went to the log and I see:
[12:40:21 PM] Stage: Build
[12:40:47 PM] Copy [$Configuration$]
[12:40:47 PM] Copy action completed successfully
Really don't have enough information to go on, to determine what it did from the log.
The time I ran this build, it was 6:40 AM here, which shows in the display interface but not the plain text log.
I then went and edited the build and realized that I set the source directory to $configuration$ instead of $Source.CATS_Docs$ one of the great features of FB is that it logs the variable values in the log instead of just the names this is really helpful in debugging problems in your build scripts.