Just sharing here how I deleted all content from my 30k+ karma account. It's an easy to use, open source, and private way to do it, check out PowerDeleteSuite.
No need to install anything, just bookmark the JS script and run it. This tool was posted here almost 3 weeks ago, but I thought of enforcing it, with the great blackout approaching. The best thing about PDS is that it should remain working since it doesn't use the API.
PDS is able to export your comments, but to export saved items you might want to check Rexport - this one uses the API however, so maybe run it in within the next hours.
I hate having to do this, but Reddit doesn't deserve the community it has.
You should check that your stuff isn't undeleted by Reddit. Some other people have reported them doing that.
I used it to overwrite everything so if they restore it they'll have a whole lot of comments saying "So long and thanks for all the cheese." I did it twice just in case of reversion.
They are probably reverting to a backup copy they have from before the protest started. Not just simply undeleting the comment.
Honestly, I think people should keep their accounts so they can redo the post and comment edits and/or deletes if necessary.