The new vSphere Replication (VR) has been improved over since the 1st VR with SRM. The VR’s main improvements is the VSS integration (through VMware Tools) and doesn’t merely request OS quiescence, but flushes app/db writers if present. Can create application consistent copies of entire VMs.
It is simply impossible to transfer specific state of running VM without some sort of snapshot even in theory! In reality, during each replication cycle they do create hidden snapshot to keep the replicated state consistent, just different type of snapshot (exact same concept as Veeam reversed incremental).
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