Database Availability Group (DAG)

A Database Availability Group (DAG) is a way to ensure email data remains accessible even if servers or components fail. It involves linking multiple mail servers together so they work as a team. If one server has an issue, others automatically take over, keeping email services running smoothly. Think of it like a backup plan where your email data is stored on several servers simultaneously, providing higher reliability and reducing downtime for users. This setup is common in large organizations to maintain continuous email availability and protect against data loss.