Could we have a system in which we could save unfinished boards posts as drafts kind of like emails?

I can't tell you how many times I accidently get an entire post gone before it is sent out. What I would like is a draft system, where unfinished posts would be saved as drafts before they are sent out. This would allow people to work on posts over longer periods of time and save people the trouble of re-writing an entire post.