I think Carlo Wood’s introduction to the problem is about as eloquent as I could say it: “It happens to everyone sooner or later: a split second after you hit Enter you realize your mistake, but it’s too late; you just deleted a valuable file or directory for which no backup exists. Or maybe you have a backup, but it’s a month old… and in shock you see the past month flash before your eyes as you realize in pain what you’ll have to do all over again…”