I wouldn't rely solely on native Microsoft retention if the data is critical. Microsoft 365 follows a shared responsibility model, which means while the platform is secure, long-term backup and recovery still fall on the user. Native retention policies are helpful for short-term recovery, but they can fall short in cases like accidental deletion beyond retention windows, ransomware, or compliance audits.

That's why many professionals still use dedicated tools like the Aryson Office 365 Migration Tool from Aryson Technologies. It adds an extra layer of protection with features like incremental backups, tenant-to-tenant migration, and full metadata preservation. I find that especially important for businesses handling large volumes of mailboxes, SharePoint data, and OneDrive files.

In practice, combining Microsoft's built-in retention with a specialized solution gives better control, redundancy, and peace of mind--especially in enterprise environments where data loss simply isn't an option.