I'd like to save references and copies to/of all the comments, and submissions made by the account, as well as a listing of upvoted/downvoted links, in addition to private messages, in a user-friendly and presentable format, kind of like how facebook account exports work with styled HTML files in a .zip archive.
What's the closest one can come to this?
There is unfortunately no in house option from Reddit itself, nor are there any 3rd party apps that allow this.
However, using the Reddit API, you could use: http://www.reddit.com/user/karmanaut/overview.json
or to return in XML format: http://www.reddit.com/user/karmanaut/overview.xml
Of course you can fetch just your comments or your submitted links:
→ /user/username/overview → /user/username/submitted → /user/username/comments → /user/username/liked → /user/username/disliked → /user/username/hidden → /user/username/saved → /user/username/gilded
For message threads this would be:
/message/where[ .json | .xml ]
→ /message/inbox → /message/unread → /message/sent
E.g. http://www.reddit.com/message/inbox.json
Full documentation can be found here: http://www.reddit.com/dev/api#GET_user_%7Busername%7D_about.json
Btw, I implemented a tool for that: https://github.com/karlicoss/rexport. It only cares about exporting data, so rendering to HTML need to be handled separately.
