How to autosave files when terminal is closed

"au VimLeavePre * w" only works when I exit vim with something like
":q!" but not if I close my terminal window.

Error detected while processing VimLeavePre Autocommands for "*":
E749: Empty buffer

VimLeave[Pre] is being called, but the buffer is not saved, probably
because it's closed before that event is triggered. Is there another
event that gets triggered during the closing sequence that will allow
me to autosave, or another way to do this?

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