Have you contacted Unitrends?   I noticed they have a number of whitepapers on their site.  Including one on VMware environments.  www.phdvirtual.com/whitepapers-brochures-videos-backup EQL storage is going to play a pretty passive role here.   Whatever is going to act as the desitination device for backups will need access via iSCSI to a volume on the EQL storage.  Or if you want to use NFS,  connect the NFS server to EQL storage, and share out that volume via NFS.  I do that inhouse to create a Datastore with all my ISO images.  Making access very easy Regards, 
We just purchased PHDVirtual for our backup regime in our little virtualized environment. It hs been successfully installed but i am having challenges pointing it to an iSCSI target. I am using two dell equallogic ps 6000 arrays in a group. I want to backup to another array of the same make and design or use an NFS outside the group if possible. These arrays are on a SAN connecting to dell R910 as hosts. I am having a challenge to have PHDvirtual operational in the virtual environment and i suspect i am not familiar in how to setup my backup unit.
Backup setup