Comment Re: Centralized on GitHub! LOL! (Score 1) 116
Well... on GitHub the wiki _is_ actually stored in a Git repo... and all of the pages are simply Markdown. They are VERY easy to move to many other systems (or even to view locally).
GitHub even publishes an open source version of its wiki renderer to make it even easier: https://github.com/gollum/goll...
NOW: The bugtracker stuff is a little more difficult. You can use the GitHub API to pull out all of the info easily enough and store it locally... but you have to do some sort of transformation to get it into a new format if you're trying to move to a different service.
Personally, I've done this the other way around. We went from using Trac on our own servers to using GitHub. I wrote scripts to take all of our Tickets from Trac and upload them to GitHub as Issues using the GitHub API. It was a pain but not impossible....