Auto Back up of Doc available?

Good day, I have so far spent about 250 hours creating a Acrobat document.   (This is the first time this has happened).  Acrobat decided to go through my entire document and erast words and letters indiscriminantlky throughout the document.  I Hope I don't have to spent 100 hours going through trying to fix this!  Is there some way I can download an older auto backed up version of the doc from earlier in the day when things were fine?

Thanks, Mattee