FC0-U71 Security Practice Question
Which backup strategy involves keeping three copies of data on two different media types with one copy offsite?
⚠ Common exam trap
FC0-U71 often tests the confusion between specific backup types (full, incremental, differential) and overarching backup strategies like the 3-2-1 rule, so candidates must distinguish between the method of copying data and the policy for storing copies.
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 backup rule
The 3-2-1 backup rule is a widely recommended strategy that specifies: at least 3 copies of data, on 2 different media types, with 1 copy stored offsite. This ensures redundancy and protection against various failure scenarios, including local disasters. The other options are specific backup types, not strategies for copy distribution.
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 backup rule
Why this is correct
The 3-2-1 rule specifies three copies of data, stored on two different media types, with one copy held offsite. This matches the stem's requirement exactly, providing redundancy against media failure and site-level disasters such as fire or theft.
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Full backup
Why it's wrong here
A full backup copies all selected data every run but says nothing about copy count, media diversity or offsite placement. The 3-2-1 rule describes that topology, so a full backup alone does not satisfy the scenario.
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Differential backup
Why it's wrong here
Differential backup copies data changed since the last full backup, reducing restore chains, but it does not define three copies across two media with one offsite. The 3-2-1 rule governs that redundancy, not the backup type.
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Incremental backup
Why it's wrong here
Incremental backup copies only data changed since the last backup of any kind, shortening backup windows, yet it specifies no copy count, media diversity or offsite location. The 3-2-1 rule covers that, not the backup method.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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