Hi Joseph,
that "Image Level" backup as OVA file is a monthly backup as a basic for us, to
have a complete virtual machine.
There are also weekly full and daily incremental backups on filesystem level using a
backup agent and remote backup.
Our biggest V-disk is 300GB which is exported in 29 minutes (lucky one, since the 30 min
timeout ist still a problem)
Having bigger disks I would separate system and data disks so you maybe can export your VM
including only the system disk, and backup the data disk as filesystem incremental.
have a nice weekend,
Lars