Original sentence: As long as there is a "pulse" or "heartbeat" from the main server to the second server, the second server will not initiate its systems.Failback, conversely, is the  process of restoring a system/component/service in a state of failover back to its original state (before failure).Failover is the capability to switch over automatically to a redundant or standby computer server, system, or network upon the failure or abnormal termination of the previously active server, system, or network.In some systems failover is intentionally not entirely automatic, requiring human intervention.The automation is done using a "heartbeat" cable that is connected to the two servers.This is called "automated with manual approval", as the activity is automatic once approval is given.Virtualization software is allowing failover practices to become less reliant on physical hardware.ja:フェイルオーバー
Edited sentence: As long as a regular "pulse" or "heartbeat" continues the main server to the second server, the second server will not initiate its systems.At server-level, failover automation takes place using a "heartbeat" cable that connects two servers.Failback, conversely, involves the  process of restoring a system/component/service in a state of failover back to its original state (before failure).Some systems, intentionally, do not failover entirely automatically, but require human intervention.The use of virtualization software has allowed failover practices to become less reliant on physical hardware.This "automated with manual approval" configuration runs automatically once a human has approved the failover.ja:フェイルオーバーIn computing, failover is the capability to switch over automatically to a redundant or standby computer server, system, or network upon the failure or abnormal termination of the previously active  application,.server, system, or network