Backup Exec 2010 with VMWare

I have a few questions re: using Backup Exec 2010 with the VMWare agent.  Environment is a new VMWare environment with three ESX hosts that will be hositing 11 - 12 vm's, connected to an iSCSI SAN.  I am considering using BE2010 with the VMWare agent to back up the vm's to a quantum LTO 4 tape drive hosted on another physical server.  My question is in regard to how much space the vm's use on the tape when backed up.  For example, let's say I have four vm's, each with 50 GB provisioned for use by the virtual disk (configured as thick \ zeroedthick, which I believe is the default).  On each of those vm's let's say there is 20 GB of actual data.  Therefore, the configured size of the four vm virtual disks is 200 GB, but there is only 80 GB of actual data.  If I back up all four of these vm's with BE2010, how much space is actually used on the tape drive, 200 GB, or 80 GB?  If it is 200 GB, then can I reduce it to 80 GB by implementing thin provisioning?  If so, I have read it is best to implement that at the SAN level as opposed to within VMWare, is this accurate?
Thanks very much
rdillionSystems AdministratorAsked:
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Paul SolovyovskySenior IT AdvisorCommented:
Backup Exec 2010 uses the VMware vStorage API and should normally backup the actual data inside the VMDK.  Unline VCB which backs up the vmdk as a whole the vStorage API does a much better job.

The SAN level works well but it depends.  If you have enough resources the backup of VMs directly is the easiest solution and with the vStorage API I believe it is direct to target which means that it goes directly from the ESX host to your storage location bypassing the proxy server as happended in the past with VCB

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rdillionSystems AdministratorAuthor Commented:
Thanks for your help on this paulsolov
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