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My recent experience is that if you have draft auto-save on, then it reliably saves any changes immediately. To be safe until you're sure, have 2 tabs open, 1 for the saved draft so you can check it.

Good to know. I do most of the work elsewhere like Google docs and/or PeakD so I've got back up, then the final tweaks when I paste it into InLeo. I'll make more use of the draft feature in future I'm sure, but too sketchy at the moment!