Today we're rolling out two new features on Android and iOS to make backup and sharing easier on low connectivity. Now your photos will back up automatically in a lightweight preview quality that's fast on 2G connections and still looks great on a smartphone. And when a good Wi-Fi connection becomes available, your backed up photos will be replaced with high-quality versions.
The company is also making it easy to share many photos at once. The Google Photos app now sends first in low resolution then later updates in higher resolution when connectivity permits.
You can download Google Photos from the App Store for free.