Maybe not much?
A few months ago, I ran out of power (my mistake, I use full screen apps to avoid the distraction, so I didn't realize I was unplugged)
After plugging in and restarting Linux then the ancient version of Word I was using, I got a pleasant surprise: the "autosaved" version of the document I was editing, with nothing lost!
As for llm, Excel 2010 may not have been made for AI, but wine copy/paste and a few scripts work surprisingly well!
Word is similar.
Features from later versions will either not show up or show up as boxes
Back then, Word's auto-save updated the file that you were working on rather than creating a separate backup file. I liked that better, though there might have been a good reason for changing approaches in later versions of Word.