Backup sizes using VMware agent
I am in the process of trialling Backup Exec in conjunction with the VMware agent. I have a quick question. As a test I dumped 4 VMs using VMware VCB. The VMDKs are very large but are obviously not at full capacity. As a result the size of the files dumped totalled 70GB.
I have configured Backup Exec to backup the same 4 VMs. I have chosen not to use GRT and to my surprise the total amount of data dumped for the same 4 VMs is 160GB!
Obviously both VCB and Backup Exec remove whitespace otherwise the backups would have been much larger than that anyway. But I cannot account for the discrepency in the size difference between the two types of backup. Ultimately this will be coming accross a WAN link so obviously the smaller the backup size the better.
I am using vSphere4 U1 with the latest version of vCenter. I have just downloaded the latest version of Backup Exec 2010.
Anyone have any ideas on why this might be?