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Get a past version of your project with Git

git checkout old version
git get old copy
git branch checkout revision

http://stackoverflow.com/questions/849265/do-you-need-to-create-a-branch-to-check-out-a-specific-git-revision

basic git commands

http://www.kernel.org/pub/software/scm/git/docs/git-checkout.html
http://www.kernel.org/pub/software/scm/git/docs/git-branch.html

git checkout -b wayback cea27c49754ba091094e53732b42fe0661076a9a