Which backup type creates a new backup containing all changes since the last full backup?

Which backup type creates a new backup containing all changes since the last full backup?

• A. Full backup
• B. Differential backup
• C. Incremental backup
• D. Mirror backup

Answer: (B)

A differential backup collects every file that has changed since the last full backup. After a full backup is made, each differential backup includes all changes that occurred since that full backup, so the amount of data grows with time until the next full backup is run. This makes restoration straightforward: you apply the last full backup, then apply the latest differential to bring everything up to date. This differs from incremental backups, which only save changes since the previous backup (which can require chaining several increments to restore). A mirror backup is an exact copy of data at a point in time, not a delta.

A differential backup collects every file that has changed since the last full backup. After a full backup is made, each differential backup includes all changes that occurred since that full backup, so the amount of data grows with time until the next full backup is run. This makes restoration straightforward: you apply the last full backup, then apply the latest differential to bring everything up to date. This differs from incremental backups, which only save changes since the previous backup (which can require chaining several increments to restore). A mirror backup is an exact copy of data at a point in time, not a delta.