![]() And this means that I’ve spent a considerable amount of time musing about Windows file systems, file system filters, and the Filter Manager framework. We’ve been running our new and improved Developing File System Minifilters for Windows seminar for some time now. Last reviewed and updated: 10 August 2020 To continue the backup chain after such changes, you need to create active full backup instead of incremental backup. For example, such changes can be made when you boot your computer using a Linux-based antivirus rescue disc. The Veeam CBT driver cannot detect data block changes made on a volume that is mounted in a non-Windows OS.If data blocks are changed on a volume while this volume is mounted on another Windows-based machine, during the next backup job session, Veeam Agent for Microsoft Windows will also read all data from the volume to create incremental backup.As a result, incremental backup will require greater time. In this case, during the next backup job session, Veeam Agent for Microsoft Windows will need to read all data from the backed-up volume to create incremental backup. If the Veeam Agent computer shuts down unexpectedly, the Veeam CBT driver may fail to register information about changed data blocks in a VCT file.The folder and its parent folders must not be reparse points. ![]() The folder and its content must not be compressed or encrypted.If you use the Veeam CBT driver, the C:\ProgramData\Veeam\EndpointData\CtStore folder accessibility is crucial for a successful backup. 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. VCT files are stored in the C:\ProgramData\Veeam\EndpointData\CtStore folder on the Veeam Agent computer. Information about changed data blocks is registered in VCT files. 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: 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. To activate the driver after installation, Veeam Agent for Microsoft Windows needs to reboot the computer. You can perform this operation at any time you need. To enable the advanced CBT mechanism provided by the Veeam CBT driver, you need to install the driver in the Veeam Agent control panel. Concurrent operation of Microsoft BitLocker and Veeam CBT driver may result in driver failures and may prevent the OS from starting. The updates allow to use the Veeam CBT driver with 4 KB sector hard drives.ĭo not install the Veeam CBT driver on a computer running Microsoft Windows Server 2008 R2 SP1, 2012 or 2012 R2 if one or more volumes on this computer are encrypted with Microsoft BitLocker (or other encryption tool), or if you plan to use Microsoft BitLocker to encrypt volumes on this computer. To learn more, see these Microsoft KB articles: KB4535102 and KB4516065. If your computer runs Microsoft Windows Server 2008 R2 SP2, make sure updates KB4535102 and KB4516065 are installed in the OS.To learn more, see this Microsoft KB article. ![]() Without this update installed, the OS running on a protected computer will fail to boot after you install the Veeam CBT driver. The update adds the SHA-2 code signing support that is required for verification of the Veeam CBT driver signature.
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