Do scheduled copies only repeat for machines that aren't successful?

If you setup a Copy task to copy a file to the currently logged on user's desktop on a bunch of machines, and schedule it to repeat every X hours, when it runs the repeated cycles, will it do the task even on machines that were successful already, or will it only copy the file to machines that didn't get it previously?

I don't want to keep writing the file to computers over and over if it worked the first time, but i'm afraid that might be what it's going to do.