The good news is that if you are thinking about picking up the Google Pixel 3, Google has confirmed that just like the previous Pixel models, you will be getting free unlimited photo storage at full resolution. “With Pixel 3, you can save all your favorite moments with free, unlimited photo and video storage in original resolution. It’s hassle-free, you don’t have to think about back-ups. Come back to Google Photos later and search for the beach photos you took on your Pixel 3, and they’ll pop right up.”
However Google does note that this free unlimited full resolution backup is only valid until the 31st of January, 2022. This is regardless of when you purchase your phone, meaning that if you really want to take advantage of it you should buy it right now. The Pixel 2 had a similar expiry date, although theirs was set for 2020, but the original Pixel seems to be free for life, which we guess is Google’s way of acknowledging early adopters.