With the recent release of Razorback 0.4.1 we decided to update the Virtual Appliance image to this release. The target audience for the appliance is people that want to test drive the system without going though the process of installing the system and its dependencies. The appliance is based on FreeBSD 9.0 (i386) and requires 4GB of RAM on your host and 20-30GB of hard disk space. We build the VM in VMWare ESXi, but it should run on any hypervisor that can import an Open Virtualization Format archive (OVA) virtual machine.”]
Source: https://blog.talosintelligence.com/2012/02/razorback-appliance-getting-started.html