A Differential Backup captures all files changed or added since the last full backup, growing with each run, as described.
Option B (Full System Backup):Copies all data, not just changes.
Option C (Incremental Backup):Changes since the last backup (any type), not full.
Option D (Online Data Backup):Delivery method, not a type.
“Differential Backup targets files modified since the last full backup, providing a cumulative change set for recovery” (Module: Data Backup and Recovery, Section: Backup Types).
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