I'm not sure Facebook is the best storage since I was thinking the original resolution won't be there? I have been adding my photos to thislife.com. It has an awesome facial recognition software so you can find photos of certain people. You can create albums (or stories) in there too. They have unlimited free storage and will automatically back up photos from your phone when you have wifi. The only drawback is you can only download one photo at a time on the free plan. They are the original resolution though.
Thislife will also import your photos that are on Facebook for you. It's part of Shutterfly.
Google photos is cool too. It has unlimited storage if you don't mind a smaller resolution that they say is still excellent for print quality. (Not sure about this). But they also will back up your photos from your phone automatically.
Amazon Prime members get unlimited photo storage. I haven't used it that much. But that was one of the main reasons I paid for the membership. lol