Calculate a Recovery-Point Gap
Subtract last completed backup time from the failure time in matching units.
About 22 minutes, plus any extended practice
Supplied materials
- Paper and pencil; answers may also be spoken or typed.
- All cases, labels, numbers and rules are supplied on this page. No real account, private information or purchase is needed.
Learn the idea
A recovery-point gap describes how much recent work might be absent from a restored backup. It differs from the time needed to restore service. Our model assumes the last backup is usable and no later backup exists. Subtract the backup time from the failure time to find the gap.
Subtract last completed backup time from the failure time in matching units. A usable backup can still omit work created after it was made.
Use this supplied case: Paper clock: last usable backup at hour 5; failure at hour 8. Maximum later-work time absent from this backup? The task is to connect the given information to the computing idea. Write a short evidence trail so another learner can reproduce your choice. The simplified case describes the stated model, not every real system.
- Represent the supplied worked case with a labeled drawing, table or short trace.
- Subtract last completed backup time from the failure time in matching units.
- Explain why the worked answer fits and why one alternative does not.
- Try the new check and practice cases; revisit the stated rule if your evidence does not match.
See the method in action
Paper clock: last usable backup at hour 5; failure at hour 8. Maximum later-work time absent from this backup? The supported answer is 3 hours. Applying the stated rule gives 3 hours. Subtract last completed backup time from the failure time in matching units. A usable backup can still omit work created after it was made. Calculation: (8-5) = 3.
Check your reasoning
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Helpful tips
- Subtract last completed backup time from the failure time in matching units.
- A usable backup can still omit work created after it was made.
See the answer and explanation
4 hours
Using the supplied inputs: (11-7) = 4. Subtract last completed backup time from the failure time in matching units. A usable backup can still omit work created after it was made.
Take it further
New last usable backup at hour 14, failure hour 19. Expected:5-hour recovery-point gap. Restore duration is a different quantity.
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More practice: try new cases
Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.
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