The data backed up by the differential backup is relative to the data added and modified after the last full backup.

The statement accurately defines a differential backup. A differential backup strategy involves copying all data that has been created or modified since the last full backup was performed. Each subsequent differential backup will contain all the changes from the previous ones, accumulating until the next full backup is executed. This is distinct from an incremental backup, which only backs up data changed since the last backup of any type (full or incremental).

The alternative, "False," is incorrect because the provided definition is the standard, technically accurate description of how a differential backup operates. It correctly identifies the "last full backup" as the reference point for identifying changed data, which is the key characteristic of this backup method.

1. Huawei Official Documentation: HCIA-Storage V5.0 Training Material. In the chapter covering Backup and Disaster Recovery Solutions

the section on "Backup Types" explicitly defines a differential backup. It states

"Differential backup: Backs up the changed or newly added data based on the last full backup." This directly confirms the statement in the question. (Reference: HCIA-Storage V5.0 Training Material

Chapter on Backup and Disaster Recovery).

2. University Courseware: University of Washington

CSE 451: Introduction to Operating Systems

Lecture 19: Filesystems & Storage. The course notes describe backup strategies

stating: "Differential backup: copy all files that have changed since the last full backup... To restore

you need the last full backup

and the last differential backup." This corroborates that the reference point for a differential backup is the last full backup. (Reference: UW CSE 451

Lecture 19 Slides

"Backup" section).

3. Academic Publication/Textbook: Silberschatz

A.

Galvin

P. B.

& Gagne

G. (2018). Operating System Concepts (10th ed.). Wiley. In Chapter 12

"Mass-Storage Structure

" the section on "Backup and Restore" discusses various backup types. The text explains that a differential backup copies all files modified since the last full backup

which aligns with the question's premise. (Reference: Chapter 12

Section on Backup and Restore).