The aim of the article is to study conceptual principles of storing documents in electronic form, in particular, electronic documents, digital documents and creating metadata for them, taking into account integration processes of grounding national information resources in archival and library spheres of activity. Additionally, to trace tendencies in the implementation of existing concepts, to identify the best Ukrainian practices, to highlight defects, and offer possible ways to solve problems. Research methods. This study uses the following methods: theoretical, as moving from the abstract to the concrete, reality reflection in thinking; empirical, as observation and comparison; complex, as system analysis, synthesis and modulation; special, as graphic and component analysis; prognostication. Scientific novelty consists in implementating a systematic interdisciplinary comparative analysis of the problem of storing documents in electronic form in archives and libraries, in order to determine the directions for solving this problem, using the definition of common requirements for similar information objects and processes, particularly, in the context of the initiative to create the National Electronic Library of Ukraine, in which it is offered to integrate information on objects of national heritage stored in archives, libraries, museums, as well as thereafter data from publishers. Main conclusions. Based on the results of this research, it should be stated that Ukrainian archivists achieved the greatest success in developing the overall system from creation the documents in electronic form to their transmission for permanent storage. An important issue is the development of the “long-term storage” system, the formation of which, in our opinion, should begin with the requirements for the information objects with which this system will be filled. This will significantly affect the structure and content of the metadata needed to manage this system. The successful experience of Ukrainian archivists and librarians should be used here. The most urgent task is to put the finishing touches to the Concept of creating the National Electronic Library of Ukraine according to the best domestic and foreign practices.