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This skill details implementing a ransomware-resistant, immutable backup strategy using the restic tool. It leverages S3-compatible Object Lock (Compliance Mode) to ensure Write Once Read Many (WORM) storage, preventing deletion or modification by attackers. The process includes automated backup, cryptographic integrity verification (restic check), and scheduled restore testing, adhering to advanced security standards like 3-2-1-1-0.

This guide details the implementation of a robust, ransomware-resilient backup architecture following the extended 3-2-1-1-0 rule. It covers critical steps such as classifying assets, defining RPO/RTO, implementing immutable or air-gapped storage, and isolating backup credentials from the production domain. Use this knowledge to design a multilayered defense against data loss and ensure reliable recovery points.