It seems I just talked about Discus, but I have a new article for you to check out. Webmonkey posted an article on how to back-up your Discus comments using the Discus API. I use wordpress and I’m lucky enough to have my comments sync back to my blog platform. If you are using anohter blog platform, you may not be so lucky yet.
Instead of loosing your data somewhere in the blogosphere (especially in a time when so many Web 2.0 start-ups are disappearing) why don’t you follow the steps in the article and back up your data.