We only had 3-5 documents online. 1 of those documents was a spreadsheet VERY important spreadsheet. All documents disappeared after the reported error occurred. Google wanted the document URLs to retrieve the 'lost' documents. We only were able to get a hold of 1 URL for the critical shared spreadsheet, which was finally recovered.

All other documents were lost, but luckily they were not critical. But we still lost them. Hope this clarifies?

Was it "just" a spreadsheet, or did it use some custom scripting? Or in other words, how would you have backed it up? Just export it as a file every hour, and store somewhere (other than Google drive)?