Suggestion: Drafts

Before I go and make the post I wanted to make, I need to make this suggestion. This is the 4th or 5th time I've written a substantial post, or a reply to a post, and then accidentally closed my tab or hit the 'back' button in my browser.

Is is possible for you to implement a 'save as draft' feature, or even a 'current draft' (only capable of saving one post or reply at a time, so if we hit the back button, we can hit forward again to retrieve our post) feature?

Cheers,
Hyrum Graff