Hi folks -- I'm tired of some users constantly using 'snapshots' as a backup mechanism, and it's tedious to manually clone or backup vmdk's for them, so I thought I'd give VMWare's "Virtual Data Recovery" tool a try, in my ESXi 4.1 Enterprise environment.
Seemed straightforward to deploy and configure (a bit of Googling needed to find the initial UID/PWD), and as suggested by the Docs added a 2nd 'hard disk' to the appliance to serve as the storage repository: a 1.5 TB disk created on an NFS-shared NAS volume.
I selected about 20 vms, chose 'today' in the schedule so it would kick off, and -- boom. System hangs after 15 minutes with high-cpu/memory warnings. I finally get the guest OS to shut down (take a while to clean-up all these inflight operations) and I power it off and reconfigure it with 2x the vcpu and RAM: 4 and 8. But on powering up, again I get warnings and the system in unresponsive. I don't see what I'm doing wrong. 
The VM's/VMDK's I'm backing up aren't tiny at ~50GB each, but....
Thx