Offserver Backup via a iSCSI or SAS SAN
does Netbackup has a way of backing up a HP San with VMware Datastores on it, leveraging the SAN's snapshot feature and that way backing up from the SAN directly? If have read this is called Offserver backup. Veeam actually offers something like this in their latest release.
Backup Exec Advanced Disk Option has something like it, but is for Windows snapshots only. I have a virtualization layer in between (VMware)