Join us for the fifth session in the CaSDaR Data Stewardship Training series, where we turn our attention to two deeply interconnected pillars of responsible data stewardship: data selection and long-term preservation. In an era of ever-growing data volumes, knowing what to keep, how to keep it, and for how long is one of the most consequential decisions a data steward can make. Poor selection and preservation practices put research outputs at risk of being lost, inaccessible, or unusable over time — undermining both the scientific record and the investment made in collecting the data in the first place. This session will equip you with the frameworks, tools, and practical judgment needed to make sound decisions about data selection and to implement robust preservation strategies that stand the test of time. This training session will be run by Digital Curation Centre (DCC).