There was an error updating the deduplication volume
Great care should be taken when making changes to a Windows registry.Registry modifications should only be carried-out by persons experienced in the use of the registry editor application.
Other reason could be; presence of faulty media which cannot be consumed by Backup Exec to perform the backups.
Please confirm you are running version 22.214.171.1240, 126.96.36.1995 or 188.8.131.524 prior to installing this patch.
You can check this under Help | About in Veeam Backup & Replication console.
Check to make sure the server is on and that the services are running.
(Permission denied) V-454-25 02/24/16 .432 Device Io: sts_open_server Pure Disk: BE-CAS dedup 2060029 02/24/16 .432 Device Io: ostaspi: sts_open_server Pure Disk: BE-CAS as dedup error 2060029 02/24/16 .432 Device Io: ostaspi: authorization with server Pure Disk: BE-CAS has failed can also be used to debug a Deduplication Folder Offline issue.
This is a troubleshooting article showing some of the Issues that one might encounter when working with the Deduplication storage and how to go about solving them or collect info that would help Veritas Technical Support to solve it quicker for you. Deduplication folder is offline Possible Causes: Dedupe service not starting, Dedupe credentials not correct, Dedupe folder corruption It is important to start your checks by making sure the disk is healthy.