Mirror Backup
A Mirror Backup is a backup method that creates an exact, bit-for-bit copy of the source data, maintaining the same directory structure, file attributes, and content as the original. This type of backup provides a complete replica of the source system.
Key Characteristics
- Exact Replication: Creates a perfect copy of the source data structure
- Real-time Synchronization: Often updated in real-time or near real-time
- No Compression: Maintains original file formats and structures
- Instant Access: Data is immediately accessible in its original format
Advantages
- Fast Recovery: Immediate access to data without restoration processes
- Complete Structure: Maintains original directory structure and file attributes
- Real-time Availability: Can be configured for continuous synchronization
- Simple Management: Easy to understand and manage
Disadvantages
- High Storage Requirements: Requires same amount of storage as source
- Network Intensive: Synchronization can consume significant bandwidth
- Single Point of Failure: If source is corrupted, mirror reflects the corruption
- Limited Versions: May not maintain historical versions of files
Best Practices
- Implement proper change tracking mechanisms
- Use alongside other backup types for comprehensive protection
- Monitor synchronization status regularly
- Consider storage costs and network impact
Use Cases
- Real-time backup and disaster recovery
- High-availability systems requiring minimal downtime
- Critical systems with strict recovery requirements
- Content distribution and replication scenarios