Google is warning users that it will soon delete their websites.
Don't panic: only sites served from Google Drive accounts are being wiped. Google deprecated Drive as a hosting option on August 31, 2015 and gave users a year to get their act (and files) together. That deadline is now nearing, so Google is issuing final warnings.
If your site's url is googledrive.com/host/[yourvaluehere]
, you need to sort yourself out in the next few weeks.
Google recommends either switching to the Drive API to serve content, or the third-party host Firebase which is tooled up for easy migrations. ®