This document summarizes and compares Dropbox and Google Drive. Dropbox allows users to earn extra storage space by referring others to sign up, up to a maximum of 16GB total. Both services support a wide variety of file types for storage and sharing, including documents, images, videos and audio files. They offer features like selective folder syncing, version history, sharing links, and commenting on files. Google Drive integrates with Gmail for easy access and allows saving email attachments directly to Drive.