I have tested a dork in the Google Search and have found interesting
results.
Dork : *inurl:wp-content intext:backup-db*
   - This gives us the result of Various backup files/Folders stored in
   wp-content/uploads directories of various websites.
   - It also gives database backups consisting of SQL backup files of
   various websites who have not secured their sensitive directories.
Kaustubh Kale