After introducing Goals in Google calendar, they have introduced a new feature in Google Photos Android App. They have brought manual backup option which was required since the launch of Google Photos app.
Google Photos update has also brought some new changes along with bug fixes and other enhancements. So, now if you are on a data plan then also you can sync and share your photos. If you have a plan with a strict data cap, you’re probably using the former — but sometimes, just sometimes, you’ll want to break that rule in order to quickly sync and share your smartphone snaps.
You can select “backup now” and voila — those images are being synced with your Photos library. The version 1.18 of the Photos app, is rolling out now in the Play Store.