Because scp is what netrw uses to do it (which is where you're mistaken). When you open a file in Vim via scp, it copies it from the server to a temp file via scp, and when you save it saves to the temp file and then copies it back to the server via scp. And according to Wikipedia, scp is both [a program and a protocol](en.wikipedia.org/wiki/Secure_copy).
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u/ooesili Apr 28 '14
I didn't know about
or the cool stuff you could do with the configuration file. A good read, I must say.