Question 15 of 144
SK0-005 server-administration Practice Question
A system administrator is configuring a backup schedule for a critical database server that must be available 24/7. The company's recovery point objective (RPO) is 1 hour and recovery time objective (RTO) is 4 hours. The database files change frequently, but the operating system and application binaries rarely change. Which of the following backup strategies would BEST meet these requirements while minimizing storage and backup window impact?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Full backup daily, incremental backup every hour
Option D is correct because daily full backups provide a recent recovery base, and hourly incremental backups are small and fast, meeting the 1-hour RPO with minimal backup window. Restoration applies at most 24 incrementals to the latest full, which fits within the 4-hour RTO. Option A is wrong because weekly full backups with hourly incrementals may require restoring too many incrementals, risking the RTO. Option B is wrong because hourly differential backups grow in size throughout the day, increasing backup time and storage. Option C is wrong because weekly fulls with hourly differentials cause exponential growth in differential size over the week.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Full backup daily, differential backup every hour
Why it's wrong here
Hourly differential backups include all changes since the last full, growing larger each hour and extending backup windows.
- ✗
Full backup weekly, differential backup every hour
Why it's wrong here
Combining weekly fulls with hourly differentials results in increasingly large differentials that consume excessive storage and time.
- ✓
Full backup daily, incremental backup every hour
Why this is correct
Daily fulls ensure fast recovery, while small hourly incrementals meet the 1-hour RPO with minimal impact on the backup window and storage.
- ✗
Full backup weekly, incremental backup every hour
Why it's wrong here
A weekly full with hourly incrementals may force restoration of many incrementals, potentially exceeding the 4-hour RTO.
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Last reviewed: Jul 26, 2026
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