Invent drafts. Auto save drafts.

To me, it's just barely short of a moral principle that software should never accidentally lose user content. "Crash-protect" is only adequate with a very broad idea of a "crash". On mobile or in a browser tab, the app might get killed at any time to save memory. Am I going to go to Wikipedia on my phone to get some info for what I'm writing in your app, and come back to find a blank text box again? Or if I get distracted in the middle of it and then have to reboot my computer fit an update? These might look like orderly shutdowns, not "crashes".