FC0-U71 Security Practice Question
A company's backup strategy requires three copies of data, on two different media types, with one copy offsite. Which backup rule does this follow?
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
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3-2-1 rule
The 3-2-1 backup rule: three copies, two different media types, one offsite.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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3-2-1 rule
Why this is correct
The 3-2-1 rule specifies exactly three copies of data, stored on two distinct media types, with one copy held offsite. That maps precisely onto the company's stated requirements, whereas other schemes such as 3-2-1-1-0 add offline or verified-restore conditions the stem never mentions.
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Incremental backup
Why it's wrong here
Incremental backup copies only data changed since the last backup of any type; it is a backup method, not a retention rule. It is tempting because incremental backups are common in strategies, but the 3-2-1 rule describes copy count, media diversity, and offsite placement, not backup type.
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Differential backup
Why it's wrong here
Differential backup copies all data changed since the last full backup; it is a backup method, not a retention rule. It is tempting because differential backups feature in many strategies, but the 3-2-1 rule concerns three copies, two media types, and one offsite copy, not the backup type used.
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Full backup
Why it's wrong here
Full backup copies the entire dataset every time; it is a backup method, not a retention rule. It is tempting because full backups underpin many strategies, but the 3-2-1 rule specifies copy count, media diversity, and offsite placement, not whether backups are full, incremental, or differential.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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