Amazon Cloud Drive is a virtual data storage service. Subscribers can store their data on Amazon's servers and sync all of their different devices when they go online.
Amazon offers two different Cloud Drive plans. One allows users to store unlimited photos, but all other file types are limited to a cumulative five gigabytes. There is also a plan that allows unlimited storage of any type of file. Users pay an annual fee for the service, and the "unlimited photos" plan is substantially cheaper than the "unlimited everything" plan.
Amazon Prime members are automatically subscribed to the "unlimited photos" plan for free.