The answer is that an untested backup is the most likely cause of the restoration delay. Without periodic testing, the actual time required to restore data from a combination of weekly full and daily incremental backups is unknown, leading to a significant underestimation of the recovery window. This is a core concept in business continuity planning, as the restoration process involves not only loading data but also verifying its integrity and sequencing, which can fail or slow down if never rehearsed. On the CISA exam, this question tests your understanding that backup strategies are incomplete without validation; a common trap is to blame the backup media or frequency, but the root cause of a delay is almost always a lack of testing. Remember the mnemonic: “Backups without tests are just wishes.”
CISA Practice Question: Information Systems Operations and Business Resilience
This CISA practice question tests your understanding of information systems operations and business resilience. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An organization's backup strategy involves weekly full backups and daily incremental backups. After a system failure, the restoration takes longer than expected. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Restoration process not tested
Option D is correct because without periodic testing, the recovery time may be underestimated. Option A is plausible but not the most likely cause given the time issue; B and C are incorrect because they are not directly related to the restoration time.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Incremental backups not stored offsite
Why it's wrong here
Offsite storage affects availability, not restoration speed.
✗
Full backup frequency too low
Why it's wrong here
While low full backup frequency can affect recovery complexity, it is less likely the primary cause of unexpected delay.
✓
Restoration process not tested
Why this is correct
Without testing, the actual time required for restoration is unknown, leading to unrealistic expectations.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Tape rotation failure
Why it's wrong here
Tape rotation failure would cause missing backups, not slow restoration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CISA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which CISA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Information Systems Operations and Business Resilience — This question tests Information Systems Operations and Business Resilience — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Restoration process not tested — Option D is correct because without periodic testing, the recovery time may be underestimated. Option A is plausible but not the most likely cause given the time issue; B and C are incorrect because they are not directly related to the restoration time.
What should I do if I get this CISA question wrong?
Identify which CISA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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