This paper explains why native Microsoft 365 retention and redundancy do not replace true backup needs. It details risks such as accidental deletion, internal threats, ransomware, and identity compromise. The book clarifies the shared-responsibility model and outlines data-protection gaps that require third-party backup, including long-term recoverability, granular restoration, and Entra ID configuration protection. It provides best practices for selecting a backup solution, developing strategy, simplifying operations, and ensuring resilience across Microsoft 365’s core workloads.

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