Purpose
The VBRCatalog is by default located at C:\ on the Veeam Server, and you may need to change the location.
Solution
You will need to make changes to the registry to change the VBRCatalog folder location. To do so:
1. Stop the Veeam Services
2. Check the permissions that are set on the folder
3. Unshare the folder and move it to a new location
4. Now share the folder and reset the permissions
5. Then navigate to the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam Backup Catalog
Find the string called CatalogPath, right-click it and choose modify
Under Value Data, edit the field to display the new location
Example: D:\VBRCatalog\
6. Restart the services mentioned above