I've also been working on less files locally. Everything is sitting in Google docs. Or worse, I've mailed it to gmail and it sits there unread.

I rsync between my two nix boxes. My wife's Win box I do every now and again, mostly video and pictures.

Drop box for scripts I need across the nix boxes.

And I do a manual copy to an external, my folder structure is the same on all boxes but I like to watch this one.