Before you delete those Google Plus Photos
I recently stumbled across Google Plus Photos, and naively asked, "What are all these photos doing here?" then even more naively deleted them, and then even more stupidly still, I permanently deleted them.
They were all the pictures for my blogs. That's where blogger stores its pictures that you upload and add to your blog.
That's why my blogs no longer have pictures.
I also learned that Google Plus can serve as a backup for all the pictures on your phone, and all the pictures on your computer. It's free as long as the pics (and vids) are under a certain size.
Google to find out how to do it.