ISC2 Systems Security Certified Practitioner (SSCP) Practice Question
Your organization currently performs a full system backup every Sunday night. To shorten the weekday backup window and reduce storage costs, you propose switching Monday through Saturday jobs from differential to incremental backups. Which of the following accurately describes the key trade-off you must present to management before making this change?
Periodic full backups are no longer required, eliminating the need to manage multiple backup generations during restoration.
Recovery becomes faster because the most recent incremental backup alone is sufficient to restore the system to its latest state.
Backup jobs will finish faster and consume less space, but a full restore will take longer because each incremental set since the last full backup must be reapplied in sequence.
Both backup and restore times will increase because redundant data is written during every incremental backup.
An incremental backup copies only the data that changed since the last backup of any type, so the amount written each night - and therefore the backup window and storage consumption - is minimized. However, restoring a system now requires first recovering the most recent full backup and then applying each subsequent incremental set in order. This can lengthen overall restoration activities and jeopardize the organization's ability to meet its required recovery-time objective (RTO).
The other options are incorrect for these reasons:
A switch to incrementals decreases backup time; it does not lengthen both backup and restore times.
A single incremental set is insufficient for a complete restore; the last full backup is still needed.
Periodic full backups remain necessary, because relying solely on incrementals would eventually make restoration impractical and risk data integrity.
Ask Bash
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What is the key difference between incremental and differential backups?
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What is a Recovery-Time Objective (RTO) and why is it important for backups?
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Why are periodic full backups necessary even when incremental backups are used?
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ISC2 Systems Security Certified Practitioner (SSCP)
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