Use a DVCS repo on a portable disk? I use a USB flash drive to store Mercurial bundles of changes that I do to my private repos (todo list, browser bookmarks). Bundles can store changes that aren't included in another repo or all changes, I had two repos of which one had exactly the state after pulling changes from a bundle, so I sent a bundle with new changes only to the other computer. I don't know such a solution for git, I copy an archive with the whole bare repo.
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