How to restore photos from iphone backup? ?

A little less than a year ago i traded in my Iphone 6s for an Iphone 11. I did not want to do this since i had tons of unsaved photos on my phone but he said if i backed it up, i could later recover the photos. I chose not to transfer the backup to my new phone as he said i could still recover it later. Now, how do i retrieve the backup and the photos? Everywhere i look says to plug in the old phone, but i traded in that day. 

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