csup'ing the ports tree doesn't download any source code for the apps in the tree. All it downloads are the Makefiles and patches that make up the ports tree. Source code is only downloaded when you *build* or *install* the app, using the ports tree.
Remember, the ports tree is just a framework for downloading, patching, compiling, and installing software. It's just a bunch of Makefiles. The entire ports tree, uncompressed, is only about 70 MBs.
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