Most forums and many websites (like gmail) are able to save your post in a cookie as you type. If you navigate away by mistake, the post will be waiting for you if you go right back.
Does the billion dollar forum have that feature? I got so used to it I forgot this forum is so old... :/
I have been a victim of this several times and I had no option than to start afresh to type again. I was so pained that instead of me to raise a topic here, I rather had to write a review to my mobile phone producers that they should make a function that will only allow back button in their mobile phone to work when you double click. Maybe you can set it to work once, but for the sake of BTT, I would set mine to work when I double click. My this, I will not mistakenly click the back button.
I don't know if BTT save cookies for security reasons, since the platform has been hacked before.