My mistake. Mea culpa! It works perfect!

I did rsync in the command line and the only way to check the function is to check the result on the transfered files. There is no other feedback from the program if it executes rsync or not (which is a bit awkward, but more a rsync-issue). So you need to trust it more or less.

Somethin else:
What about implementing a button like "Execute now"? This way you don't have to change the setting if you want to see the result, which could be very helpful for command execution mode. Just an idea...

And thanks a lot for the program!