The article provides a comparative analysis of the basic network protocols for accessing files in corporate network attached storages (NAS). The article also discusses existing IT solutions in the field of distributed (cloud) data storage systems, shows the features of the integration of these information systems with NAS of various types. Based on a comparative analysis and identified shortcomings of existing solutions, an information system architecture for interaction with file storages of various types (FTP, SMB/CIFS, S3) is considered. An approach is presented that proposes the use of a Application Programming Interface (API), which implements the Representational State Transfer (REST) model for managing data files in storages using various network access protocols. This approach also involves the integration of a NoSQL database (MongoDB) to store file metadata and use fast search operations for the necessary data in storages. The relevance of the implementation of the presented information subsystem for small and medium-sized businesses is shown.