That moment of pure existential fear through your veins and heart thumping when you open your writing app for it to have glitched and vanished a story folder with over 40,000 words of revised mapped out material that won't manifest ever again and neither was it in the auto cloud backup history.
Yay for my paranoia of emailing myself an extra copy even if thinking that's ridiculous, then remembering I did just that recently and recovered it because losing weeks of all that work would have ended me.