■ A VRA must be installed on every Hyper-V which hosts virtual machines that require protecting in the protected site and on every Hyper-V that will host the replicated virtual machines in the recovery site.

■ The VRA compresses the data that is passed across the WAN from the protected site to the recovery site.

■ The VRA automatically adjusts the compression level according to CPU usage, including totally disabling it if needed.

■ A VRA can manage a maximum of 1500 volumes, whether these volumes are being protected or recovered.

■ The VRA is a custom, very thin, Linux-based virtual machine with a small footprint, disk – memory and CPU – and increased security since there are a minimum number of services installed.

■ Zerto recommends installing a VRA on every hypervisor host so that if protected virtual machines are moved from one host in the cluster to another host in the cluster there is always a VRA to protect the moved virtual machines.