I decided to try out different editor options to see what they offered ... the one I'm using as I write this:


Has been periodically displaying "Auto-Saved" in the lower-right corner of the editor window as I type. When I back out without posting then start a new post I see, in the lower left corner of the editor window:


So it looks like a "draft" option is available, but only for the last post created/edited. Given the number of times I've had an in-process post disappear due to a network or server disruption (or, um, PEBCAK), this is a very much appreciated feature!