Database backup is one of the most critical safety measures in any system. Application code can be rewritten and servers can be rebuilt, but database loss is often much harder to recover from.

SQL Server supports different backup types. A full backup contains the entire database. A differential backup contains changes since the last full backup. A transaction log backup can allow recovery to a specific point in time.

A backup strategy is not complete unless restore tests are performed. A backup file is only useful if it can actually be restored when needed.

Recovery Point Objective and Recovery Time Objective are important planning concepts. RPO defines how much data loss is acceptable, while RTO defines how quickly the system must be restored.

A good backup strategy should include automated jobs, offsite storage, regular restore tests and alerting. Backup is not only a technical task; it is a core part of business continuity.