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Difficulty: HardBusiness Continuity and Disaster Recovery

A network operations team is reviewing disaster recovery procedures for a database server hosting critical transactional data. The current strategy includes a weekly full backup performed every Sunday at midnight, supplemented by daily backups during the workweek. The team needs to optimize for rapid system restoration while accurately understanding how file flags and data sets interact during recovery. Which of the following statements accurately describe the technical mechanics and restoration workflows of incremental and differential backups? (Select TWO.)

  1. Restoring a system configured with a differential backup strategy requires applying the Sunday full backup followed only by the single most recent differential backup taken prior to the system failure.Answer
  2. Incremental backup jobs clear the archive bit on processed files, whereas differential backup jobs leave the archive bit intact.Answer
  3. C
    Restoring a system configured with an incremental backup strategy requires applying only the Sunday full backup and the single incremental backup taken immediately preceding the outage.
  4. D
    Daily differential backup files consume progressively less storage space as the week advances compared to daily incremental backup files.
  5. E
    Differential backups clear the archive bit after execution to ensure that the next differential job excludes previously backed-up files.

Answer

The correct statements are that differential restoration requires applying only the full backup plus the single latest differential backup, and that incremental backup jobs clear the archive bit while differential backup jobs do not clear it.
Differential backups accumulate all data modified since the baseline full backup because they do not clear the archive bit. Consequently, restoring a system running differential backups requires only two restore steps: the full backup baseline and the single most recent differential backup. Conversely, incremental backups clear the archive bit on each run so that subsequent jobs only grab newly changed files, requiring every incremental backup file to be restored sequentially after the full backup.

Step-by-Step Solution

1
Analyze how differential backups track changed data and manage the archive attribute.
Differential backups copy all files modified since the last full backup and do not clear the archive bit, allowing each differential backup to contain the cumulative changes of the week.
Because the archive bit is retained, every differential file contains a complete aggregate of changed data since the baseline full backup.
2
Determine the restoration path for a differential backup strategy.
The restoration sequence requires the baseline full backup plus the single latest differential backup file.
The latest differential backup file supersedes all earlier differential backup files taken during the same backup cycle.
3
Contrast incremental backup mechanics with differential backup mechanics.
Incremental backups clear the archive bit upon completion and require restoring the full backup along with every incremental file in order.
Clearing the archive bit ensures that incremental backups contain only data modified since the immediate prior backup.

Key Concept

Differential vs Incremental Backup Restoration Mechanics and Archive Attribute Management
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Topics

Business Continuity and Disaster Recovery

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