I think there are already scripts developed to autosave your posts as draft, I will check if I can find it because that should be the second way of saving a post as draft.
It was shared above, and you did not read several replies above, didn't you?
Reading only a topic title or the first post, then jump to reply it instantly without intention and time spent for reading previous replies, is very bad posting style. Sometimes issues were solved by previous posts/ answers and you don't no longer need to make your reply if information is only repeats of what already posted.