Which mechanism ensures data availability by copying data to a secondary location, either synchronously or asynchronously?

Which mechanism ensures data availability by copying data to a secondary location, either synchronously or asynchronously?

• A. Replication
• B. Snapshots
• C. Backups
• D. Archiving

Answer: (A)

Replication is the process of maintaining duplicate copies of data at a secondary location so systems can stay available even if the primary site is unavailable. By continuously or periodically copying data to another site, it supports data availability and business continuity. It can be done synchronously, where a write is considered complete only after the copy at the secondary location is updated, providing near-zero RPO but potentially higher latency; or asynchronously, where the copy is updated after a delay, reducing latency but with a small window of potential data loss if a failure occurs. This approach is distinct from snapshots, which capture a point-in-time image for quick rollback but aren’t designed to keep a live, nearby copy available for ongoing operations. It also differs from backups, which are copies meant for recovery after data loss and are often stored offsite or offline, not necessarily kept in real-time sync. Archiving is long-term storage for retrieval later and isn’t intended to support immediate availability or continuity.

Replication is the process of maintaining duplicate copies of data at a secondary location so systems can stay available even if the primary site is unavailable. By continuously or periodically copying data to another site, it supports data availability and business continuity. It can be done synchronously, where a write is considered complete only after the copy at the secondary location is updated, providing near-zero RPO but potentially higher latency; or asynchronously, where the copy is updated after a delay, reducing latency but with a small window of potential data loss if a failure occurs.

This approach is distinct from snapshots, which capture a point-in-time image for quick rollback but aren’t designed to keep a live, nearby copy available for ongoing operations. It also differs from backups, which are copies meant for recovery after data loss and are often stored offsite or offline, not necessarily kept in real-time sync. Archiving is long-term storage for retrieval later and isn’t intended to support immediate availability or continuity.