On my note 4 I don't have the Google photos backup. Just Google+ photos. Not that long ago Google released their own photos app that was different than the one with Google+ can you disable the Google photos in application manager? If you done use google+ we can disable that also
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Google Photos can't be "Disabled" since its a downloaded app but as I said once you installed the Google Photos app the photo part from Google+ disappears from Google+ for good and everything goes straight from the Photos app
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