Microsoft 365 Exchange Online uses a Shared Responsibility Model (Microsoft handles service availability; you handle data backup.
Native features like Recoverable Items and Retention Policies are for short-term recovery and compliance, not true backup. For protection against data loss (e.g., human error, ransomware, retention policy gaps), third-party backup solutions are essential. These tools offer granular recovery, point-in-time restore, and follow the 3-2-1 backup rule (3 copies, 2 types.
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