If you would like to reduce the data in your application, simply for copying it over to the server, then you could probably remove all possible values from it by clicking on File, Reduce Data and then on "Remove All Values" in qlikiew developer.
This will remove all of the data from the model and will dramatically reduce the size of you application. You can then copy it over to the server and once deployed, you could just reload the application with the data on the server.
Alternatively you could also click on "Keep Possible values", as this will only keep the data that you have selected in your application .i.e a specific date etc.
Hope it helps,