I once felt particularly inspired, and wrote 20,000 words in a day, I had been hitting ctrl+s all day, and after reaching a good stopping point, I hit it once more. Then I heard the Seagate click of death, 20' words gone in an instant. I thought I was doing well for backups, my laptop was scheduled to do a diff backup with my server, and other computers ad midnight. This had saved me in the past, But not this time.
I still have yet to try re-writing what was lost that day, despite authoring other works. It is too disheartening.