Which backup method is typically offline, requiring the system downtime to perform the backup?

Which backup method is typically offline, requiring the system downtime to perform the backup?

• A. Hot Backup (Online)
• B. Cold Backup (Offline)
• C. Warm Backup (Nearline)
• D. Snapshots

Answer: (B)

The concept here is how backups are performed with or without taking the system offline. A cold backup is the one that is typically offline and requires downtime. In a cold backup you power down the system (and its services) and then copy the entire data set to the backup storage. Because there are no active writes during the backup, you get a clean, consistent copy of the entire system state. This approach is often chosen during scheduled maintenance windows when downtime is acceptable. When the system is online, backups are done differently. A hot backup runs while the system is live, using mechanisms to maintain data consistency without shutting down services. A warm backup sits between online and offline, offering quicker backups with some service continuity but not a full offline outage. Snapshots create point-in-time copies, usually at the storage level, and can often be taken without shutting down the system, though certain applications may require quiescing for a consistent state.

The concept here is how backups are performed with or without taking the system offline. A cold backup is the one that is typically offline and requires downtime. In a cold backup you power down the system (and its services) and then copy the entire data set to the backup storage. Because there are no active writes during the backup, you get a clean, consistent copy of the entire system state. This approach is often chosen during scheduled maintenance windows when downtime is acceptable.

When the system is online, backups are done differently. A hot backup runs while the system is live, using mechanisms to maintain data consistency without shutting down services. A warm backup sits between online and offline, offering quicker backups with some service continuity but not a full offline outage. Snapshots create point-in-time copies, usually at the storage level, and can often be taken without shutting down the system, though certain applications may require quiescing for a consistent state.