Migrating to SAP S/4HANA via Greenfield or Selective Data Transition often leaves critical legacy data in ECC systems. This blog explores three practical strategies for archiving that data: maintaining ECC in the cloud, using SAP ILM Retention Warehouse, or adopting a third-party solution like SNP Data Fridge. Each option is assessed for cost, compliance, access, and complexity—helping you choose the right long-term data retention strategy.