Documentation and origional sourced documentation do not fare well in Google SEO as it remains static and changes little. Google hates this and punishes content which does not change even though it may be the official and often correct documentation. Google favors content which is refreshed often like crowd sourced content. The problem is that it may take the gathering of a dozen or so crowd sourced pages to get the understanding and content I need while the official documentation would give me the full explanation and nuances. I would reather read the official documentation first and then go to the crowd sourced documentation to find a solution to a particualr hicup I'm experiencing. Google amy be marginalizing and ultimately killing official documentation as it will become useless if not ranked. Too often Google will show an entire page of top SERPs all from the same domain and crowd out everyone else. Google should stop playing these SEO tricks and games and really examine the content for how much unique information is presented. Its a tough job but ultimately its what people are looking for.

Rsync with another computer (desktop/laptop/server), an additional drive on your computer or with USB storage (thumb drive, hard drive etc). Rsync will update all changes with much less overhead than a complete recursive copy when updates are performed. This tutorial covers rsync use with Linux and MS/Windows. http://www.yolinux.com/TUTORIALS/Rsync.html One can also rsync to public storage like http://rsync.net/ or http://www.s3rsync.com/ as well.