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of 30What are the three main types of backups and how do they differ?
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The three main types of backups are:
- Full Backup: Complete copy of all selected data regardless of when it was last backed up. Takes the most time and storage space but provides fastest recovery.
- Incremental Backup: Only backs up data that has changed since the last backup (full or incremental). Fastest backup time, least storage space, but slower recovery as you need the full backup plus all incremental backups.
- Differential Backup: Backs up all data changed since the last full backup. Moderate backup time and storage, faster recovery than incremental as you only need the full backup plus the latest differential.
Example: If you do a full backup on Sunday, then: - Monday incremental: backs up Monday's changes
- Tuesday incremental: backs up only Tuesday's changes
- Tuesday differential: backs up Monday + Tuesday changes
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Explain the concept of backup retention and why it's important.
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Backup retention refers to how long backup copies are kept before being deleted or overwritten. It's crucial for:
- Compliance Requirements: Many industries require data retention for specific periods (7 years for financial records)
- Point-in-Time Recovery: Ability to restore data from different time periods
- Storage Cost Management: Longer retention = higher storage costs
- Legal Protection: Historical data may be needed for litigation
Common Retention Strategies: - Daily backups kept for 30 days
- Weekly backups kept for 12 weeks
- Monthly backups kept for 12 months
- Yearly backups kept for 7 years
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What is the difference between backup and archive?
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While often confused, backup and archive serve different purposes:
Backup:
- Creates copies of active data for recovery purposes
- Data remains in primary location
- Short to medium-term retention
- Focus on business continuity
Archive: - Moves infrequently accessed data to long-term storage
- Data is removed from primary location
- Long-term retention (years or decades)
- Focus on compliance and storage optimization
Example: Email backup keeps copies of current emails for quick recovery, while email archiving moves old emails to cheaper storage for compliance purposes.
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Explain RTO and RPO with examples.
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Recovery Time Objective (RTO):
- Maximum acceptable time to restore service after disruption
- Measured from disaster occurrence to full service restoration
Recovery Point Objective (RPO): - Maximum acceptable amount of data loss measured in time
- Last point in time to which data can be recovered
Examples: - E-commerce site: RTO = 2 hours (site must be online within 2 hours), RPO = 15 minutes (can lose max 15 minutes of orders)
- Email system: RTO = 4 hours, RPO = 1 hour
- Archived data: RTO = 3 days, RPO = 24 hours
Key Point: Lower RTO/RPO requirements typically mean higher costs for backup and DR infrastructure.
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What is the 3-2-1 backup rule and why is it important?
What is the importance of testing backup restores?
What is the difference between Disaster Recovery (DR) and Business Continuity (BC)?
Describe the key components of a disaster recovery plan.
What are hot, warm, and cold disaster recovery sites?
How do you determine appropriate RTO and RPO values for different systems?
Explain synthetic full backups and their advantages.
Compare tape backup vs. disk backup vs. cloud backup.
Explain the concept of data deduplication in backup systems.
What are backup windows and how do you optimize them?
Describe the difference between bare metal recovery and file-level recovery.
How do you handle database backup and recovery differently from file system backups?
Describe different types of disaster recovery testing.
What metrics should you track for backup and recovery operations?
What are the advantages and challenges of cloud backup solutions?
What is backup as a service (BaaS) and how does it differ from traditional backup?
How do you ensure backup data security and encryption?
What is continuous data protection (CDP) and when would you use it?
Explain the concept of immutable backups and their importance.
What are the key compliance requirements that affect backup and recovery?
Explain the concept of active-active vs. active-passive disaster recovery.
How do you design backup strategies for virtualized environments?
What is Recovery Point Objective (RPO) vs. Recovery Time Objective (RTO) in the context of different backup technologies?
How do you implement backup validation and integrity checking?
Describe backup strategies for containerized applications (Docker/Kubernetes).
What are the considerations for implementing backup solutions in a multi-cloud environment?
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Backup & Disaster Recovery cheatsheet
Backup & Recovery System Administration Cheat Sheet
- Summary01
- 1. Core Concepts & Fundamentals02
- 2. Backup Strategies & Planning03
- 3. Common Backup Tools04
- 4. Database Backups05
- 5. Snapshot Technologies06
- 6. Cloud Backup Solutions07
- 7. Backup Verification08
- 8. Disaster Recovery09
- 9. Advanced Topics10
- 10. Best Practices Checklist11
- 11. Key Interview Topics12
- + 3 more inside
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