Event ID 33 messages appear in the Application Event log as follows:

Details of the Application Event:
CreateFile X:\BackupExecDeduplicationStorageFolder\etc\pdregistry.cfg: The system cannot find the path specified.
Deleting the Dedupe storage folder also stops and disables the following three services:
Backup Exec Deduplication Multi-threaded Streaming Agent
Backup Exec Deduplication Manager
Backup Exec Deduplication Engine
However, the Backup Exec Open Cloud Storage Daemon service is left running. After the BackupExecDeduplicationStorageFolder directory and subdirectories are deleted, this service still attempts to access the pdregistry.cfg file, which causes the above error to appear in the application event log.
Stop and disable the Backup Exec Open Cloud Storage Daemon service. No other side-effect will be observed from this action as this service is only used in connection with the deduplication functionality.
CreateFile X:\BackupExecDeduplicationStorageFolder\etc\pdregistry.cfg: The system cannot find the path specified