It took me a while to get myself in the habit of always saving first thing. Force yourself to think of the buffers like old-school sample buffers. It is nice that you can have 8 buffers going on the Octa at once and use them without saving but I find it best to remind myself that I should treat sampling like an older hardware sampler - the buffer is for sampling input. I must save asap.
How cool would it be if turning off the machine actually showed a prompt (option in Prefs of course) that said “are you sure? Want to save your samples first?”