CompTIA A+ Core 2 (220-1202)Operational ProceduresEasy
A company wants to comply with the 3-2-1 backup rule for its critical database. Which backup configuration satisfies this rule?
- ATwo copies on the same external hard drive stored in the server room
- BThree copies all stored in the cloud with the same provider
- COne copy on a NAS and one copy on a USB drive, both onsite
- DThree copies total: two on different local media types and one stored offsite
Show answer & explanationAnswer & explanation
Correct answer: D. Three copies total: two on different local media types and one stored offsite
The 3-2-1 rule requires 3 total copies of data, on 2 different types of media, with 1 copy stored offsite. Option B is the only choice that satisfies all three requirements.
Why the other options are wrong
- A. Only one media type and no offsite copy.
- B. All copies are the same media type (cloud) and none are physically separated offsite media-wise.
- C. Only 2 copies and no offsite storage.
3-2-1 Backup Rule
A backup strategy requiring 3 total copies of data, on 2 different media types, with 1 copy stored offsite to protect against data loss.
- 3 copies total (original + 2 backups)
- 2 different storage media types
- 1 copy offsite for disaster recovery
Memory trick: Three, Two, One: Triple copies, Two media, One away from home.