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Redundancy measures for identity data storage include multi-region replication across cloud providers (e.g., AWS, Azure) and on-premise servers. Erasure coding distributes data fragments across nodes, ensuring recoverability even if multiple disks fail. Regular snapshots and versioning enable point-in-time recovery. Decentralized storage networks (e.g., IPFS, Filecoin) offer peer-to-peer redundancy, reducing reliance on single providers.