Compressing the replication data that is transferred through the network saves network bandwidth and might help reduce the amount of buffer memory used on the

vSphere Replication

server. However, compressing and decompressing data requires more CPU resources on both the source site and the server that manages the target datastore.

The

ESXi

host on the source site compresses the data, and the

vSphere Replication

server on the target site passes off the data to the

ESXi

host, where the host decompresses the data, and writes it to disk.