Exam CISA topic 1 question 1452 discussion

B. Differential backup

A mirror backup is the best backup scheme to recommend given the need for a shorter restoration time in the event of a disruption, while it allows for the fastest and easiest recovery of data. Both differential and incremental backup requires more time to restore backup than mirror backup.

While incremental backup is faster for creating the backup, the question here is how to keep the restore time as short as possible. Differential backup is faster here. So I vote for B. Since the question is not which variant has the shortest restoration time, I rule out C. Otherwise, the ISACA questions would typically ask for best, fastest. With A. I think that with high data volumes, as is the case here, the resynchronization is slower than the bulk restores trimmed for speed with full and differential backups.

Incremental backups involve backing up only the data that has changed since the last backup, whether it's a full backup or an incremental backup. This approach is more efficient in terms of storage space and bandwidth usage since it only captures changes since the last backup. Incremental backups also offer faster restoration times compared to differential and full backups since they involve restoring the last full backup and then applying the incremental changes. Given the organization's need for shorter restoration times, incremental backup is the most suitable option. Therefore, option D, Incremental backup, is the BEST backup scheme to recommend for an organization with high volumes of data and frequent changes to transactions, prioritizing shorter restoration times in the event of a disruption.

It requires less time to restore than incremental backups.

Incremental backup will take shorter time to backup than Differential backup, while Differential backup takes shorter time to restore than Incremental backup as it requires fewer steps

While mirror backup creates an exact copy of data, it may not be the most efficient option for frequent backups due to storage requirements. Differential backups store all changes since the last full backup, which can be quicker than a full backup but slower than incremental backups and may require more storage space over time. Full backups are comprehensive but can be time-consuming and resource-intensive, especially for high volumes of data with frequent changes. Therefore, incremental backup is the most suitable choice for this scenario.