Was wondering this myself. Does it autosave posts too? I used to manually save them if I was typing out a longer message, doesn't seem to be an option for that now.
Aye it seems to autosave but not sure how often it does it. I started replying to a post, realised I was talking shite, couldn't find the delete draft option so just clicked back onto the forum. Later on I went back to the thread and quoted someone else, the post I quoted was quite long and it was only just before I went to post that I realised the initial quote and half written bollocks was still there at the top! Managed to delete it in time, but I did love the delete draft option