DEA-1TT5 Backup, Recovery, and Business Continuity 1 — Questions and Answers
Question 1: What is the difference between RPO and RTO in disaster recovery planning?
- RPO is the recovery time objective, RTO is the recovery point objective
- RPO defines maximum acceptable data loss measured in time; RTO defines maximum acceptable downtime before recovery must complete (Correct answer)
- RPO and RTO both measure downtime but in different units
- RPO applies to databases while RTO applies to file systems
Correct answer: RPO defines maximum acceptable data loss measured in time; RTO defines maximum acceptable downtime before recovery must complete
RPO (Recovery Point Objective) specifies the maximum age of data that must be recovered (how much data loss is acceptable), while RTO (Recovery Time Objective) specifies how quickly systems must be restored.
Question 2: What is a 'full backup'?
- A backup that only captures files changed since the last backup
- A backup that copies all selected data regardless of when it was last backed up (Correct answer)
- A backup of only system files and configurations
- A backup that stores data in uncompressed format
Correct answer: A backup that copies all selected data regardless of when it was last backed up
A full backup creates a complete copy of all selected data, serving as the baseline from which incremental or differential backups reference.
Question 3: What is the key difference between an incremental backup and a differential backup?
- Incremental is faster to restore; differential is faster to back up
- Incremental backs up data changed since the last backup of any type; differential backs up all data changed since the last full backup (Correct answer)
- Incremental backs up files; differential backs up databases
- Incremental uses tape; differential uses disk
Correct answer: Incremental backs up data changed since the last backup of any type; differential backs up all data changed since the last full backup
Incremental backups are smaller and faster since they only capture changes since the last backup, but restores require the last full plus all incrementals; differentials are larger but need only the last full plus latest differential to restore.
Question 4: What does the '3-2-1 backup rule' recommend?
- 3 full backups, 2 differentials, and 1 incremental per week
- 3 copies of data, on 2 different media types, with 1 copy stored offsite (Correct answer)
- 3-hour, 2-hour, and 1-hour recovery time objectives for different data tiers
- Back up 3 times per day, keep 2 weeks of history, 1 year of monthly backups
Correct answer: 3 copies of data, on 2 different media types, with 1 copy stored offsite
The 3-2-1 rule recommends maintaining 3 total copies of data (1 primary + 2 backups), on 2 different media types, with at least 1 copy stored at an offsite location.
Question 5: What is a 'snapshot' in storage, and how does it differ from a backup?
- A snapshot and a backup are identical technologies with different names
- A snapshot is a point-in-time copy of a volume stored on the same system, while a backup is a separate copy stored independently (Correct answer)
- A snapshot is slower to create but safer than a backup
- A snapshot stores only metadata while a backup stores full data
Correct answer: A snapshot is a point-in-time copy of a volume stored on the same system, while a backup is a separate copy stored independently
A snapshot captures a volume's state at a point in time using space-efficient pointer or copy-on-write mechanisms on the same storage system, while a backup is an independent copy on separate media.
Question 6: What is 'deduplication' in the context of backup storage?
- Removing duplicate backup jobs from the schedule
- A technique that identifies and eliminates redundant data segments to reduce backup storage consumption (Correct answer)
- Running two identical backup jobs to verify data integrity
- Backing up only files with duplicate names
Correct answer: A technique that identifies and eliminates redundant data segments to reduce backup storage consumption
Backup deduplication compares incoming data chunks to already-stored chunks and only stores unique segments, with subsequent occurrences stored as pointers, drastically reducing backup storage requirements.
DEA-1TT5 Backup, Recovery, and Business Continuity 1
What is the difference between RPO and RTO in disaster recovery planning?