NetBeans build system downloads binaries from http://netbeans.osuosl.org/binaries/
The NetBeans PMC can upload binaries to this website using the SSH Keys at https://svn.apache.org/repos/private/pmc/netbeans/secrets
NOTE: If you don't have access to this SVN repository you should ask being granted by filing a ticket to INFRA usingJIRA.
Once your access is granted you can upload binaries using scp or ssh:
$ ssh -i ftp-osl-osuosl-org netbeans@ftp-osl.osuosl.org
NOTE: This page is a work in progress. Exact procedure is subject to change.