Sorry to hear that Deedee. One forum I use has a RESET button (which just clears the text in the reply-box. Its right next to SEND and I've pressed that on more than one occasion
My advice to anyone choosing a Blog host is to consider Wordpress, it has two great strengths IMO:
It offers "Pages" as well as "Posts". "Posts" are what most people think of for a Blog, time-line / diary articles.
"Pages" are permanent and hierarchical, so you can use it to set up a mini-website. So if you want an About page, or similar, then it won't get buried after a couple of months like a Blog post does. Or you can make an Index page with links to various "perennial" posts.
And secondly, as Kata said, it auto-saves the text you type every 30 seconds or so, so even if you SAVE/overwrite with a wrecked version, accidentally, you can still go back and retrieve what you need from an earlier version.
Having said that, I haven't looked closely at Blogger recently, so perhaps it has those features too now?