You can set up Veeam Agent for Microsoft Windows to use the Veeam CBT driver instead of the default CBT mechanism. The Veeam CBT driver is a class filter driver for volume devices that helps Veeam Agent for Microsoft Windows keep track of changed data blocks in a more efficient way. The driver is intended for servers running applications with large database files.
To use the Veeam CBT driver, the Veeam Agent computer must meet the following requirements:
- Run a Microsoft Windows Server OS
- Run the Server edition of Veeam Agent for Microsoft Windows
Prior to installing the Veeam CBT driver on a computer running Microsoft Windows Server 2008 R2, make sure that update KB3033929 is installed in the OS.
To enable the advanced CBT mechanism provided by the Veeam CBT driver, you need to install the driver in the Veeam Agent for Microsoft Windows control panel. You can perform this operation at any time you need. To activate the driver after installation, Veeam Agent for Microsoft Windows needs to reboot the computer. After computer reboot, the Veeam CBT driver will start keeping track of changed data blocks on computer volumes whose data you have selected for backup in the Veeam Agent backup job settings.
In contrast to the default CBT mechanism that supports NTFS volumes only, the Veeam CBT driver can keep track of changed data blocks on volumes that use the following file systems:
Information about changed data blocks is registered in special VCT files. VCT files are stored in the C:\ProgramData\Veeam\EndpointData\CtStore folder on the Veeam Agent computer. When the backup job runs, Veeam Agent for Microsoft Windows uses VCT files to find out what data blocks have changed since the last run of the job, and copies only changed data blocks from the backed-up volume.
Consider the following: