Back in... too olden times, I used a plain text editor to avoid this issue.
(In fact, I used MS Word... but I don't want to confess that!)
Yes, for years people have been telling me to write posts in a text editor and then copy/paste them into the blog editor, and it's a wonder I didn't adopt that method when I lost my 10th, 50th, and even 100th blog post on Blogger with Internet Explorer and a virus-ridden version of Windows XP in 2006. But, I persisted and *still* write everything out in the blog editor, itself. I live, I learn, I lose writing blurbs from time to time. Haha.