contingency

An Incremental Backup captures only files created or modified since the last backup (full or incremental), making it faster and less storage-intensive, as Kelly is doing.
* Option A (Full Backup):Copies all data, not just changes.
* Option B (Normal Backup):Synonym for full backup, not selective.
* Option D (Differential Backup):Copies changes since the last full backup, not the last backup.
* "Incremental Backups save only data changed since the last backup, optimizing speed and storage for frequent operations" (Module: Data Backup and Recovery, Section: Backup Types).

Latency is the time delay between a request and the system's response, directly matching the question's description.
* Option A (Reaction):Not a technical term for delay.
* Option B (Durability):Refers to data persistence, not response time.
* Option C (Nonrepudiation):Ensures actions can't be denied, unrelated to delay.
* "Latency measures the delay in system response to requests, a critical factor in assessing recovery and performance" (Module: System Resilience, Section: Performance Metrics).