>I see clearer now. But now I nead to learn what David means to be more rapid ...

It simply means "don't build until you're done". In your test runs, simply run the main.prg or whatever is the starting point in your app, or write a little prg which will simulate the runtime environment (clear all, close data all, set path to etc) and launch the app - from the command window. When all works that way, and you want to build the executable, then you can do your backups and build an executable.

On my current project I build an executable maybe once or twice a week - except when I'm preparing a deliverable. During that phase I may build one every five minutes, but then I'm doing nothing big, and I already have everything backed up.