D. Percentage of failed restore tests.
The most appropriate key risk indicator (KRI) for backup media that is recycled monthly would be the percentage of failed restore tests. This KRI directly measures the effectiveness of the backup process because it indicates the proportion of backups that cannot be successfully restored when tested. A high percentage of failed restore tests would indicate a significant risk that critical data may not be recoverable in the event of a data loss incident, which is a key concern in backup and recovery operations.
While the other options, such as the time required for backup restoration testing, the change in the size of data backed up, and the successful completion of backup operations, are important metrics in backup and recovery management, they do not provide a direct measure of the risk associated with the integrity and recoverability of the backed-up data. The percentage of failed restore tests specifically addresses this critical aspect of data protection.
By tracking the percentage of failed restore tests, organizations can identify potential issues with their backup media and take corrective actions to ensure that their backup and restore processes are effective and reliable.
The issue with recycled backup media is that it wears out. Increased failure rate of restore attempts would indicate the media was potentially having issues.
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