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The automated management of bibliographic resources in higher education institutions relies structurally on integrated library systems (ILS), whose relational architecture supports critical processes of cataloging, circulation, and the long-term preservation of information. In open-source software environments, technological flexibility can coexist with scenarios of cumulative obsolescence when updates are not performed on a regular basis. This study empirically validates a methodological framework based on ETL (Extract, Transform, Load) processes applied to the Koha library management system, migrating from the obsolete version 3.12 to version 20.11. The research adopts an applied approach using an instrumental case study design conducted at a Latin American public university. The implemented strategy consisted of a database-to-database migration using open-source data engineering tools and an iterative structural transformation model. The results show an approximate recovery of 98% of the historical information capital, preserving referential integrity and institutionally validated functionality. It is concluded that the iterative ETL approach constitutes a viable methodological alternative for overcoming generational barriers in critically obsolete ILS systems, especially in academic contexts with budgetary constraints.