Also if it was a recent post you can use your drafts to find what you originally posted at:
https://bitcointalk.org/index.php?action=drafts(particularly useful if it was a recent post that those two other sites might not have been able to grab).
It does not store all posts and limit to 100 posts. Draft page will be cleaned after 7 days.
It saves your draft posts as well. When you click on Preview, a new draft of a post will be saved. I meant with one post, you can have multiple drafts saved in Draft page.