The document discusses different backend options for mobile applications, including custom backends, iCloud, Dropbox, cloud platforms like Heroku, and backend as a service (BaaS) providers. It compares features of the options like data storage models, management requirements, costs, and lock-in. Popular BaaS providers mentioned are Parse, Kinvey, and BaasBox which provides user management, data storage, and push notifications without requiring an application server or database server.