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Backup (or Bitmap Backup) VS CDP (Continuous Data Protection)
  

George Fady Lv2Posted 2026-Sep-12 21:27

Hello everyone, and welcome. My name is George Fady, and I am a Technical Support Engineer here at Sangfor. Today, I will be walking you through this section, diving into key concepts and best practices to help you get the most out of our solutions. Let’s jump right in
Assuming you mean Backup (or Bitmap Backup) and CDP (Continuous Data Protection) from the Sangfor HCI lecture on data protection technology:  
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Feature / MetricScheduled Backup (Bitmap Backup)Continuous Data Protection (CDP)
Primary Objective
Standard data protection and archival  
Near-zero data loss protection for mission-critical applications  
RPO (Recovery Point Objective)
Minimum 1 hour (periodic/hourly/daily/weekly)  
Near-zero / sub-minute (IO activity logged at 1s or 5s intervals)  
Tracking Mechanism
Block-level dirty bitmap tracking changes between intervals  
Real-time VM I/O replication and activity logging via asynchronous cache  
Performance Overhead
Executes periodically during defined backup windows  
Completely isolated from VM QEMU via asynchronous caching to prevent host latency  
Storage Consumption
Lower; stores scheduled incremental/full image snapshots  
Higher; requires capacity for both base images and high-frequency I/O activity logs  
Recovery Granularity
Roll back strictly to scheduled point-in-time snapshots  
Granular timeline-based rollback to any second within the log retention window  

Core Differences
  • Backup (Bitmap Backup) is designed for general workloads where an RPO of 1 hour or more is acceptable, executing full or incremental jobs without consuming excessive continuous log space.  
  • CDP is built specifically for critical workloads where any hourly gap risks business continuity, capturing I/O at 1- to 5-second intervals with continuous tracking.


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