Unpack the ear in the deploy directory and it won't be copied. The more you unpack, the less will be copied.
I know. But then I cannot start the server via netboot, if I understand correctly.
And the only reason why I have to deploy the EAR as archive files is because I want to use netboot.
The netboot instance would not deploy the ear so there should be no issue with its startup. You can disable the copy by setting the jboss.deploy.localcopy system property to false.