I use google photo app to back up all my pictures. It is free and full size (up to 16M pixels) and unlimited. But the best thing is the search feature. It is freaking amazing. I can search for "purple flower" and the picture I took of a purple flower 10 years ago would show up. If I click on a picture of my nephew, pictures of him from 3 to 17 years old shows up. They must have use some kind of aging algorithm to find pictures of him. They miss some and some are incorrect but overall.. very impressive.

It is great for travel too because it will automatically make collection for your trips. You don't have to do anything. It takes all your pictures, GPS locations, and made a travel story. It has point to point maps.. all the places (including names of restaurants, shops, attractions) and interlace your pictures in the book. It even makes movies out of it.

And because it also sort your GPS locations... if you want all the picture taken at Disneyland.. it will find them in seconds. I think it identify all the objects, people, and words in the picture. I could take a picture of a Sign, and type in some of the words in the Sign and it will find it. I could type in dophin and it will find all the pictures of real dophins and stuff animal dophins.