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Database backup

A “database backup” is a copy of data stored in a database that is saved separately so it can be restored if the original data is lost, corrupted, or becomes unavailable. Backups typically include the database contents and, depending on the approach, may also include schema definitions, configuration, and transaction l

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  1. Meaning

    A “database backup” is a copy of data stored in a database that is saved separately so it can be restored if the original data is lost, corrupted, or becomes unavailable. Backups typically include the database contents and, depending on the approach, may also include schema definitions, configuration, and transaction logs.

  2. Common types

    Common backup types include full backups (a complete copy), incremental backups (changes since the last backup), and differential backups (changes since the last full backup). Some systems also use continuous or point-in-time recovery, where transaction logs are captured so you can restore the database to a specific moment.

  3. Why it matters

    Database backups support disaster recovery, business continuity, and data protection against failures such as hardware issues, software errors, accidental deletions, ransomware, or human mistakes. A backup is only useful if it can be restored, so organizations usually test restores and monitor backup success and retention policies.

FAQ

How often should database backups run?

It depends on how frequently data changes and how much downtime or data loss you can tolerate; many systems use daily full backups with more frequent incremental or log backups.

What does “restore test” mean?

It means periodically attempting to rebuild the database from backups in a controlled environment to confirm the backups are valid and the restore process works.

Are backups the same as replication?

No. Replication keeps a live copy updated in near real time, while backups are saved snapshots (or logs) intended for recovery after incidents.

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