Which feature prevents data loss during VM operations despite system failures or crashes?

Fault Tolerance is the feature designed specifically to ensure that data is not lost during virtual machine (VM) operations, even in the event of system failures or crashes. It achieves this by providing continuous availability for VMs. When Fault Tolerance is enabled, it creates a secondary instance of a VM that runs in lockstep with the primary instance. This means that every instruction executed on the primary VM is simultaneously executed on the secondary VM. If a failure occurs in the primary VM or its host, the secondary VM instantly takes over, ensuring that there are no interruptions in service and protecting against data loss.

This capability is distinct from other options. For instance, vMotion is primarily focused on the live migration of VMs between hosts without downtime but does not inherently provide protection against data loss due to failures. High Availability, while it does attempt to restart VMs on another host in case of a failure, does not guarantee that data will not be lost during the time it takes to restart the VM. vSAN, on the other hand, is a storage solution that allows for pooling and managing storage resources but is not specifically aimed at preventing data loss through operations in the same way that Fault Tolerance is designed to do. Thus, Fault Tolerance stands out