In recent decades, online access to large, high quality data collections has led to a new, deeper level of sharing and analysis, potentially accelerating and improving the quality of scientific research. These online datasets are becoming imperative at all stages of the research process, particularly in scientific, technical and medical (STM) disciplines. Since libraries have a traditional responsibility to guarantee the availability of the output of scholarly research, they have a potentially important role to play in facilitating long-term access to these resources. Yet, the role of a national library in the realm of STM data remains unclear.