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If only a few bytes change in a very large file, do you have to backup the entire file? 

  Overview  DataClassifier  Fast File Scanner  Volume Replication  Block Change Detection  MtNDMP  DataOptimizer  SQZ Library

Block Change Detection


Microtal's Block Change Detection (BCD) system allows backup applications to implement block-level incremental backups for databases, log files and other large files that that change incrementally. BCD has two components:

  • A kernel probe that monitors write operations and generates change logs.
  • A library that interprets the change logs and returns a list of extents containing the updated blocks for each modified file.


  • Very low overhead
  • File-level and block-level backup support
  • Seamless integration with Microtal’s serverless Volume Replication Library
  • Stealth operation, a technology which eliminates the need to  change existing mount options or modify applications


  • Solaris
  • Linux
  • Other platforms as market need dictates



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