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Just opened google photos and there are 11239 items waiting to back up.
On your phone or on a desktop?
I'm not entirely familiar with how google photos work (I use owncloud & local storage backups), but you should be aware that recovery of deleted files works best when you run recovery software before anything else - There is a risk that using other software will write to the parts of the drive that the photos are stored (but not linked), and they'll be gone for good.
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