In recent years, Cloud Computing is gaining more and more popularity. But if someone will try to create a Cloud Application suitable to work with several different platforms, he will face a problem. The problem is that each platform provides its own Application Programming Interface (API) to interact with Cloud Applications. Therefore it’s difficult to create one unified application functioning on various platforms properly. Topology and Orchestration Specification for Cloud Application (TOSCA) provides a solution for this problem. With the help of TOSCA, it’s possible to define several models of interaction with many different APIs within one TOSCA Application. A TOSCA runtime environment is responsible to choose and process the right model and serves as a layer between external interfaces of a TOSCA application and an API of a platform. This allows to automate the migration of TOSCA applications between platforms which use completely different APIs. The description of a TOSCA Application is stored in a Cloud Service ARchive (CSAR), which contains all components necessary for the application life-cycle. Cloud Applications are often defined in such way that during their deployment some external packages, programs and files need to be downloaded via the Internet. These downloads can slow down the deployment and when the access to the Internet is limited, unstable or missing, they can prevent the installation at all. In addition, the download from external sources can compromise the security of applications. This document considers the development of the solution to this problem through the predownload of the necessary data. Different methods of encapsulation of CSARs will be defined. It will be described the architecture of the software solution which can recognize external dependencies in a CSAR, eliminate them, resupply the CSAR with all the data necessary for deployment and also change the internal structure of the CSAR to display the achieved self-containment. The prototype of the software will be implemented and validated.