Array-based: VMware SRM support both synchronous (continuous) and asynchronous (snapshot-based) storage replication mechanisms. It depends on the storage hardware manufacturer which of these are supported in the vendor-specific Storage Replication Adapter (SRA).

vSphere Replication (VR): VMware developed the vSphere Replication engine. The method vSphere Replication uses to track changes to a VM is very similar to the CBT mechanism that is part of VMware vSphere Storage APIs – Data Protection. However, it is not CBT, preventing interference with other solutions that utilize CBT. VM snapshots are not
used at the source unless Microsoft Volume Shadow Copy Service (VSS) quiescing is enabled when configuring replication.