This guide explains why Microsoft 365’s native features are not full backup and why organizations still own their data under the shared responsibility model. It describes risks like accidental deletion, security threats, and retention gaps, and shows how those can lead to permanent loss without third-party protection. The document walks through core requirements for a robust backup solution: granular recovery, flexible retention, security and compliance, and support for hybrid/on-prem storage. It closes with best practices for planning, implementing, and testing Microsoft 365 backups.

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