I just Ctrl-Alt-Deleted out of Mathematica after I crashed it while running. I had not saved it all day and had done quite a lot of work on it. When I reopen the file, it shows a version with none of the changes I made today -- I guess I never saved it. I don't think I've actually lost work through not saving in fifteen years. Have I managed to do it today, or is there some way to view scripts that ran in the past but weren't saved?
Moderator's note: I am leaving this question open rather than closing it as a duplicate of one of several linked in the comments because it specifically asks about the possibility of recovering data from a Notebook that was not saved. Please do not post answers explaining how to set up an auto-save system. Such methods should instead be posted in answer to other questions. – Mr.Wizard