You can utilize vSphere Fault Tolerance for your virtual machines to ensure business continuity with higher levels of availability and data protection than is offered by vSphere HA.

Fault Tolerance is built on the ESXi host platform, and it provides continuous availability by having identical virtual machines run on separate hosts.

To obtain the optimal results from Fault Tolerance you should be familiar with how it works, how to enable it for your cluster and virtual machines, and the best practices for its usage.