How to recover from an unintended delete problem

For a more comprehensive and updated post, refer to How to recover deleted post (updated).Recovering from an accidental deleteYou have accidentally deleted some posts or links, etc., or you may even have messed up your template, and you need to recover from the mistake urgently. What do you do?This is what you can do. Do a search (Google, Yahoo, etc.) for some terms in your past post and see if