The aim of this paper is to provide an overview of the state of preparedness and disaster planning in libraries of the University of Zagreb. Firstly, the paper introduces the university libraries system in the Republic of Croatia. Then, the selected sample of the libraries is presented, their condition from previous years is shown, according to the analysis within the university parent activities of the National and University Library in Zagreb. The principles of protection of library materials and the legislation that determines them are presented, along with the presentation of important documents at the international and national level. Recommendations related to the protection of materials in the event of a catastrophe are especially highlighted, with reference to past examples from the war history of the croatian libraries, and cases of floods and fires as an incentive for further development of recommendations for dealing with disasters. Afterwards has been given an overview of the new state of the pandemic and its impact on shaping new approaches, services and determining the future of higher education and libraries in the world and in Croatia. In the area of Zagreb, the consequences of the earthquake on the entire as well as university library system are also presented. The paper then provides an overview of good examples of new service delivery practices in emerging situations. Finally, a survey was conducted on a sample of 43 libraries of scientific-teaching and artistic-teaching components of the University, and the university's main library - NSK. This was followed by a comparison of the results of previous research on the state of sustainability of the plan in the event of a disaster in Croatian libraries, and new research among libraries and their users which seeked to provide insight into the new circumstances and user attitudes towards libraries now, as well as their understanding of library value and satisfaction with services during the 2020 quarantine.