The CBT volume filter driver may fail to install on Windows 2008 R2 Core systems.
You may notice that your image-level backups are being promoted to fulls, or that the "Would you like to install this driver now?" dialog did not display during the agent install process. These are indications that the CBT volume filter driver failed to install.
To resolve this issue, follow the steps below to manually install the the CBT volume filter driver:
- Log into your Windows 2008 R2 Core system.
- Run uvcbt.msi, which is typically located in c:\pcbp\installers\uvcbt.msi.
- Complete the wizard.
- Reboot if not prompted by the Wizard.
Note: These steps are specific to image-level backups, not Hyper-V host-level backups.