Most of the latest smartphones which we own now captures photos / videos at a very high resolution that can occupy more space. Even the videos shot at Full HD eats a lot of space on phone's memory or sd card. No need to say specific about 4K videos!.
So what is the app that gives unlimited free backup space?. Answer is Google Photos
This app gives an option to upload / sync unlimited photos and videos at high resolution. The app just syncs all the photos and videos from your phone to the google server and the synced photos and videos can be accessed from any device, anywhere, via any browser, anytime by hitting photos.google.com
Deleting the photos from the phone will not delete the copy from the google server.
There are three quotas available as follows,
1. Original quality - Backs up media at Original resolution which counts against the 15 GB google storage space. It allows us to buy more storage if we had crossed the 15 GB limit
2. High quality - Unlimited free backup at High resolution. Photos are compressed to 16 MP, Videos are compressed to high definition
3. Express - Unlimited free backup at Reduced resolution. Photos are compressed to 3 MP, Videos are compressed to standard definition
Some of the useful features of the Google Photos app
1. Acts as a gallery
2. Frees up space
3. Creates smart albums automatically
4. Advanced photo editing
5. Sharing
6. Smart and powerful search
7. Allows to link many phones under same google account and so on...