New technologies make it possible to support more and more business processes computer-aided. Through that, it becomes increasingly important to protect business data from data loss. This can be achieved by backing up the data on secure data storages in shortest possible intervals. In the future, potential cheap storage space with the opportunity to save data in short intervals, could be provided by cloud storage services. But without further security measures, many cloud storage providers or potential attackers are able to view the stored data. Therefore, the question arises which steps are required to be able to save critical data in the cloud in a secure way.
Based on literature research, the essential aspects concerning cloud storage services as well as data backups are shown. The most important facts became part of a concept for saving data in the cloud in a secure way. In a further step, a prototype was developed.
Finally, the created prototype does not only meet the requirements of some use cases constructed in the document. The prototype also represents the answer to the research question. As well as it is possible to detect changes of files in defined directories, the prototype is able to calculate differences to previous versions. The described strategy for encrypted and distributed storage of data across multiple cloud storage services has the consequence, that no provider has access to the entire data. For this reason, it is almost impossible for a cloud storage provider or a potential attacker to view the stored data, even if the authentication or encryption algorithm are outdated. The described solution of distributing data to different cloud storage services also ensures that the failure of a single provider does not reduce the availability of the stored data.