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CERN Analysis Preservation (CAP) is a FAIR research data preservation repository platform for LHC experiments, allowing collaborations to deposit and share structured information about analyses and associated data assets. The platform provides data ingestion pipelines for preserving and sharing final n-tuples, ROOT macros, Jupyter notebooks, and full analysis workflow code, as well as intermediate datasets. CAP facilitates reusability of preserved data assets by capturing and re-executing reproducible recipes and computational workflows using the REANA Reusable Analysis platform. The platform integrates with external services such as Zenodo, CERN Document Server, Indico, Research Organization Registry, and ORCID, and supports code preservation and Git repositories through webhook integration with GitHub and GitLab. CAP aims to respond to demands for data management frameworks to support data and knowledge preservation, reuse, reinterpretation, and reproducibility of research findings.