I hate when that happens. When I use Word or Excel I have it set to autosave every 5 mins. That save is bogus. I have had the power go out and such to turn around and lose everything.
I started using stackedit.io I can link it to my google login and access it anywhere. I have most of my postings from when I started.
Ouch...power going out, that's the worst thing that can happen to a writer (except for bluescreens, they are equally bad). I was used to use Stackedit too, clean and nice editor with syncing features. Just not sure why I didn't use it for that time...