That moment during my nanowrimo event when my laptop crashed and I lost 12,000 words of my novel made me a firm believer in cloud backups
I was at a coffee shop in Portland at 2am, finally hitting the climax of chapter 18, when the screen went black and I realized I had been saving everything to the desktop for a month, so now I start every writing session by hitting Ctrl+S into Google Docs before I even type a single word.