SK0-004 · Question #811
When attempting to restore a folder from a backup, a systems administrator receives an error stating the media is corrupted and must be erased. The administrator tries several tapes and receives the…
The correct answer is A. Perform backups with verify B. Perform random test restores. When backups are found to be corrupted only at restore time, two proactive measures can catch failures early: verifying writes during backup and periodically testing restores.
Question
When attempting to restore a folder from a backup, a systems administrator receives an error stating the media is corrupted and must be erased. The administrator tries several tapes and receives the same error. Which of the following would the administrator MOST likely do to ensure future backups are usable? (Choose two.)
Options
- APerform backups with verify
- BPerform random test restores
- CVerify the backup tapes are labeled correctly
- DVerify the tapes offer enough capacity
- EPerform only full backups
How the community answered
(23 responses)- A87% (20)
- D9% (2)
- E4% (1)
Why each option
When backups are found to be corrupted only at restore time, two proactive measures can catch failures early: verifying writes during backup and periodically testing restores.
Performing backups with verify instructs the backup software to read back the written data immediately after each backup job and compare it to the source, catching media or write errors before they go undetected. This ensures the tape is confirmed readable at the time of backup rather than discovering corruption only when a restore is needed.
Performing random test restores validates the full end-to-end process - media readability, software compatibility, and data integrity - simulating an actual disaster recovery scenario so failures are discovered and corrected before they are critical.
Correct labeling is an organizational practice that prevents selecting the wrong tape, but it does not detect or prevent media corruption.
Verifying tape capacity ensures data fits on the media, but a tape with sufficient capacity can still be physically corrupted and unrestorable.
Performing only full backups increases backup completeness but does not address the underlying issue of undetected media corruption.
Concept tested: Backup integrity verification and restore testing
Source: https://learn.microsoft.com/en-us/windows-server/storage/data-deduplication/understand
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