This is mentioned on page 38 in beta 1.4, but perhaps not emphasized enough. What you really want to do is set up a version control system. These days there are several high quality and free DVCS systems to chose from (e.g., git, hg, and bzr). With such systems there is no server that you need to set up, unless you want to. As such, there is no excuse not to use such a system.
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