In order to create and develop the system in an effective way, the design process requires a synthesis of the possible scenarios and actions, translating them into elements of the interface and finally planning their lay-out on screens in a user friendly way. At the same time, in order to give the system a bit of „character”, we have designed pictures for the key screens, which refer to the essence of the „cloud storage” system in a very literal way and inform the user about what has happened in the system or what the user should do in the next step.