Efficient Hyper-V Incremental Backup using Vembu CBT (Changed Block Tracking) Driver
Vembu developed CBT (Changed Block Tracking) driver to track the modified data blocks alone during Hyper-V incremental backup. Vembu CBT driver is a file system filter driver which tracks the changed data blocks of Hyper-V VMs in between the incremental backup schedules. So, the Hyper-V incremental backup completes in minutes not in hours and also it only transfers the modified incremental data blocks rather than the complete differential data from last successful full backup.
![Restore-Type-Hyper-V-Converter](https://img.vembu.com/wp-content/uploads/2016/07/Architecture.png)
How it works
During initial full backup, Microsoft VSS services initiates the snapshot in the configured guest machine through Hyper-V integration services. Once the snapshot completes, Vembu integration service will read the VHD or VHDX files associated with the selected VMs and transfer the data to the backup storage targets.
![](https://img.vembu.com/wp-content/uploads/2016/07/Full-Backup.png)
![](https://img.vembu.com/wp-content/uploads/2016/07/CBT-Driver-Installation.png)