It backs up everything you type every 30 seconds. If you crash, or the server goes down, or you lose your post in some other manner, all you have to do is go back to the same thread and hit reply again. At the bottom left of the reply box you will see a "Restore Auto-Save" button. Click that, and all the saved text will reappear in the text box. You can test this by typing something, waiting for it to auto-save, then closing the window/tab without submitting the post. Then go back and hit reply to that same thread, and you'll see the button appear. Like this... (At this point, I closed the tab without submitting the post).
After closing this tab without submitting my post, I went back to this thread and the reply box looked like this:
I clicked the button, and then saw this:
I then finished the post, and submitted it.
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