ISC2 Certified in Cybersecurity (CC)Business Continuity (BC), Disaster Recovery (DR) & Incident Response (IR) ConceptsMedium
An organization is evaluating different backup strategies to protect its critical data. They need a solution that offers the fastest recovery time for their entire system, including the operating system, applications, and data, but they are concerned about the storage space required. Which backup strategy best fits this requirement?
- ADifferential backup
- BFull backup
- CSnapshot
- DIncremental backup
Show answer & explanationAnswer & explanation
Correct answer: B. Full backup
A full backup copies all selected data, providing the fastest recovery time because only one backup set needs to be restored. However, it requires the most storage space and takes the longest to perform compared to incremental or differential backups.
Why the other options are wrong
- A. Differential backups require restoring the last full backup plus the latest differential backup, which is faster than incremental but slower than full.
- C. Snapshots capture the state of a system at a point in time, useful for quick rollbacks, but are not typically considered a 'backup strategy' in the same context as full/incremental/differential for long-term disaster recovery of an entire system.
- D. Incremental backups save space but require restoring the last full backup plus all subsequent incremental backups, making recovery slower.
Full Backup
A backup strategy that copies all selected data, regardless of when it was last changed. It's the simplest to restore but requires the most storage and time.
- Copies all data every time
- Fastest recovery process
- Highest storage space requirement
Memory trick: Full, Incremental, Differential: Each has its Recovery-Storage balance.