Originally for Picasa, but still relevant: https://sites.google.com/site/picasaresources/Home/Picasa-FAQ/google-photos-1/how-to/how-to-remove-duplicates-in-goog

Originally for Picasa, but still relevant: https://sites.google.com/site/picasaresources/Home/Picasa-FAQ/google-photos-1/how-to/how-to-remove-duplicates-in-google-photos https://sites.google.com/site/picasaresources/Home/Picasa-FA... Tl;dr - Either filter and curate online, or deduplicate. Also, fix your backup settings.