(Nit: The GitHub wikis are also git repositories. https://help.github.com/articles/adding-and-editing-wiki-pages-locally/ https://help.github.com/articles/addin

(Nit: The GitHub wikis are also git repositories. https://help.github.com/articles/adding-and-editing-wiki-pages-locally/ https://help.github.com/articles/adding-and-editing-wiki-pag...) But anyway, the same argument could be made of an asteroid hitting your own datacenter with self-hosted GitLab instead.