Just a cautionary tale here.
My website has a large amount of comments but now I have Disqus installed, a whole bunch of my comments are missing.
It's very depressing that I might have to uninstall.
Customer support was initially responsive but now they seem to have vanished off the face of the earth.
As an example, if you check out this post, it actually has 33 comments but Disqus says it has 0.
I have done the export manually and automatically but it still is missing about 3 months of data (from August of 2012 till now.
I may have to uninstall today since my site is a production site.
Just an FYI