I am just now calming down from an alarming experience. I emailed a half-completed file to my laptop and completed the file there. I then emailed the completed work to the client. I was paid and then a couple of hours later got an alarming message that the file was only half completed. At the very end there was some of my naked research and notes, just as it has been when I emailed it to myself.
No problem, I thought. I just sent the wrong file. Unfortunately, the actual completed file was never saved on the laptop and was somewhere squirreled away in a temp file that was almost impossible to get to. Getting to it actually took my shouting spouse awake to help me find it. I was sweating the whole time, thinking I'd have to do that part of the work again from scratch. Fortunately, it was found after about a half hour of searching and cursing. I was worried that the client might think I had done it on purpose or that I was really just that incompetent.
Normally I am less of an idiot, but the danger of losing a file is always there with any writer. I am going to be the most vigilant file saver in the history of the world from now on. If this hasn't happened to you, take this as a lesson. Point and laugh if you must, but always, always save your work often.