This paper deals with the issue of library materials preservation which should be recognized as an important part of the overall library business in contemporary libraries. Materials preservation is accessed through many different aspects, from daily procedures that can preserve the material and extend its lifespan, up to preventive protection measures that libraries are required to take to prevent or at least minimize the damage caused by disaster. As part of this paper, in March 2020, a survey was conducted among the public libraries of Bjelovar-Bilogora County. The main goal was to determine the extent to which the library materials preservation is implemented in specific libraries. The results of the research are relatively satisfactory because they show that the protection of materials in these libraries is taken quite seriously. We can see this from the fact that almost all libraries have allocated certain annual financial resources intended for the materials preservation. The amount of equipment to assist in the implementation of protection measures in libraries is also satisfactory. Slightly worse is the fact that only half of the libraries have developed a Disaster Action Plan as a measure of preventive library materials preservation, but other libraries that do not yet have it have mostly expressed readiness to develop such a plan.