Which appliance is suitable for Enterprise Vault archival

Hi,

Which appliance is suitable for Enterprise Vault archival, between the following:

Netbackup PureDisk: https://www.symantec.com/netbackup-puredisk

Netbackup Appliance: http://www.symantec.com/backup-appliance

or even this third party solution if applicable EMC Centera: http://www.emc-centera.com/what-is-emc-centera.htm

any thoughts and comments is greatly appreciated.

Thanks