Not exactly the same story, but there was this one time when I was working on a long document, several days work, on an Amstrad PPC 640 (this was the early 90s)

Not exactly the same story, but there was this one time when I was working on a long document, several days work, on an Amstrad PPC 640 (this was the early 90s). Saving the file on a floppy took around 1 minute I think (maybe more) so I didn't do it often and had no copy or backup of any kind. It was around midnight, I was done and hit save. I had an external monitor, and for no particular reason, decided to move it around during the save. It was big and heavy, and while moving it I accidentally hit the power switch of the PC. Powering off the machine during disk write destroyed everything. I couldn't believe it, I stared at the machine for a while. Then I spent the rest of the night recreating the document from memory, while making frequent copies on different disks. It was a horrible moment that I remember vividly, but it taught me a valuable lesson. I never again lost any file for lack of appropriate backup.