I have my dotfiles and bin directory in a git repository on github. This makes setting up new machines easy, and ensures I have the same great settings on all

I have my dotfiles and bin directory in a git repository on github. This makes setting up new machines easy, and ensures I have the same great settings on all my machines. For other home directory stuff: documents, ebooks, etc. I store that in Dropbox. It syncs when you're online, yet works perfectly when you're offline and keeps previous versions automatically (not every change, but ever hour or so, iirc).