4.3 Given a scenario, implement workstation backup and recovery methods.
📘CompTIA A+ Core 2 (220-1202)
In IT, backups are essential for protecting data. But just having a backup isn’t enough — you need a strategy for when and how to store backups so data can be reliably recovered. Backup rotation schemes are these strategies. They help IT teams avoid overwriting backups too soon and ensure data is safe even if something goes wrong.
1. Onsite vs. Offsite Backups
Backup location is critical. There are two main types:
- Onsite Backups
- Stored physically at the same location as the workstation or server.
- Examples:
- External hard drives connected to servers.
- Network-Attached Storage (NAS) devices in the office.
- Pros:
- Fast recovery: Data can be restored quickly.
- Easy access for daily backup tasks.
- Cons:
- Vulnerable to disasters like fire, flood, or theft.
- Offsite Backups
- Stored at a separate location, away from the main office or workstation.
- Examples:
- Cloud backup services (e.g., Azure Backup, Google Drive for Business, AWS S3).
- Physical tape drives or hard drives stored in a remote data center.
- Pros:
- Protected from local disasters.
- Often more secure with encryption.
- Cons:
- Slower recovery depending on internet speed or transport.
- More expensive if using cloud storage.
Exam Tip: Know that good practice is to have both onsite and offsite backups so data is fast to restore but also safe from disasters.
2. Grandfather-Father-Son (GFS) Rotation
This is a classic backup rotation scheme used to manage backups over time.
- Son (Daily Backups)
- Smallest time frame, usually daily backups.
- Each day a new backup replaces the oldest one.
- Father (Weekly Backups)
- Weekly backups are kept for a longer period.
- Usually weekly full backups are kept, e.g., 4 weeks.
- Grandfather (Monthly Backups)
- These are monthly full backups.
- Stored for months or years for long-term data retention.
How it works:
- Every day, the “son” backup runs.
- At the end of the week, the “father” backup is updated with the week’s full backup.
- At the end of the month, the “grandfather” backup is updated.
Example in IT:
- A company has a NAS storing daily work files.
- Every Friday, they do a weekly full backup (father).
- On the first of each month, the backup is saved in the company’s offsite cloud (grandfather).
Exam Tip: GFS ensures that you can restore recent files (daily), past weeks (weekly), or months/years (monthly). It’s a tiered backup approach.
3. 3-2-1 Backup Rule
The 3-2-1 rule is an easy-to-remember guideline for protecting data:
- 3 copies of your data
- The original + 2 backups.
- 2 different media types
- Example: One backup on a NAS, another on a tape drive or cloud storage.
- 1 offsite copy
- At least one backup is stored offsite, away from the main workstation or office.
Example in IT:
- Original files stored on a workstation.
- Backup 1: NAS in the same office.
- Backup 2: Cloud storage or remote server in another city.
Why it matters:
- If the workstation fails, you have a backup.
- If the office suffers a disaster, the offsite backup saves your data.
- Using different media types protects against media failure.
Exam Tip: This is a must-know rule for CompTIA A+. It’s considered best practice for IT backup strategies.
Summary Table for Exam
| Term | Definition / Purpose | IT Example |
|---|---|---|
| Onsite Backup | Backup stored at the same location | NAS, external drive |
| Offsite Backup | Backup stored at a remote location | Cloud storage, offsite data center |
| GFS (Grandfather-Father-Son) | Tiered backup rotation: Daily (Son), Weekly (Father), Monthly (Grandfather) | Daily files on NAS, weekly full backup, monthly offsite |
| 3-2-1 Rule | 3 copies, 2 media types, 1 offsite copy | Workstation + NAS + cloud backup |
Key Points to Remember for the Exam
- Onsite = fast recovery, Offsite = disaster protection.
- GFS = tiered backups (daily, weekly, monthly).
- 3-2-1 Rule = redundancy + media diversity + offsite safety.
- Backup rotation prevents overwriting critical data.
- Using both onsite/offsite and following GFS or 3-2-1 ensures business continuity.
