I always write in MS Word so it can spell check everything. Then, cut and paste it into the platform. I can send it to editors in Word as well. So, it's better to keep a copy of it, so it's just not all on the platform. I am still typing my novel, but in a Word file. I can back it up that way too. Platforms have a way of either closing, or not being perm. I've had two close on me while working on my current Kpop serial romance. So, yeah. Typing is done on a laptop into an MS Word file. Then, cut and paste. I do understand that whole stream of conscious onto a platform writing window. But ALWAYS save a copy somewhere else. Nothing online is permanent. Back it up, always.