Google Photos corrupts your photos that you paid for
productforums.google.com
productforums.google.com
At least three copies, in at least two physical locations, at least one of which is offline.
If you are storing any digital data in one single place, no matter how trustworthy and reliable that single place may seem to be, you're at risk of losing it. Most people learn this lesson the hard way, unfortunately.
Again, just speculation based on nothing at all.