Hello.
Further details are required, such as how many VMs are required to be protected and what time out is supportable.
For HA (basic) it is required that the ESXi hosts licenses have this feature and of course have vcenter server (additional own license) and shared storage.
VMware vSpheres has several products to configure a contigency, but you must define what exactly you want to protect and how much downtime you can allow.
If we have defined the level of contigency we need, the solution can include licensing of different products and additional hardware.