The aim of the study was to contribute to the knowledge about the security risks companies face when using file storage as cloud services. There is a lot of research and surveys on cloud computing and its security, as many companies see this aspect as a key factor. When talking about file storage security, research shows that many companies restrain to make use of cloud services when they are concerned about the protection, loss and control of data, or reliability to who can see the data. However, the use of cloud services also brings a number of advantages such as flexibility and scalability. This is a qualitative study and people that somehow works with file storage as a cloud service has been used to collect data for the study. The companies that the interviewees are working in are two IT & technology consultancies, one college, a supplier of ERP systems, a company within the automotive industry and a utility company. The respondents hold positions such as IT director, IT architect, system manager, on-site IT-manager, solution architect and system integration specialist. The interviews had a semi-structured approach. The study shows that companies are aware of the security risks which are present using a cloud service, and that the companies must carefully evaluate and review what is included in the agreement with the supplier. All of the respondents who participated in the survey uses file storage as a cloud service. The majority of security risks which the interviewees addresses match the previous research about the uncertainty of data protection, who has access to data and loss of control. The conclusion is that there are security risks by storing files in the cloud, but that cloud services bring so many benefits that it is difficult for companies to restrain from. The main risks when storing files in the cloud was the location of data, reliability and backup.