ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question
During an annual business-continuity review, a security engineer must confirm that the organization's seven-year cloud archive backups can satisfy a 24-hour recovery-time objective (RTO) if the primary datacenter is lost. Which action will give the most trustworthy evidence that both data‐integrity and timely-recoverability requirements are truly being met?
Calculate and document the theoretical aggregate throughput of the restore network path to confirm it can transfer all backup data within 24 hours.
Configure automatic e-mail notifications for successful completion of each backup job in the data-protection system.
Perform periodic full restoration tests from the oldest archived backups into a separate environment and measure the elapsed recovery time.
Store an additional encrypted copy of every backup in an immutable on-premises appliance to prevent tampering.
The only way to be certain that long-term backups remain usable and that they can be restored within the required RTO is to perform regular restoration drills that load the archived data into a non-production environment and measure how long the process takes. File-level checksums (or job-success e-mails) show that a backup completed, but they do not prove that an entire system can be reconstructed within the target window. Adding another immutable copy improves durability, and calculating theoretical network throughput shows what might be possible, yet neither confirms that media are readable, that all dependencies are satisfied, or that operational steps can be completed in time. Periodic end-to-end restore testing therefore provides the strongest assurance that integrity is intact and the 24-hour RTO is achievable.
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ISC2 Certified Secure Software Lifecycle Professional (CSSLP)