VM replication can work over two data paths:
Replication over WAN accelerators is supported only for snapshot replicas.
Replication over a direct data path is recommended if you replicate VMs over the LAN or fast connections. In this case, Veeam Backup & Replication transports data directly from the source host or off-host backup proxy to the target host.
If you have a weak WAN link, you can replicate VM data over a pair of WAN accelerators. WAN accelerators provide advanced technologies to optimize VM data transfer:
- Global data caching and deduplication
- Resume on disconnect for uninterrupted data transfer
WAN accelerators add a new layer in the backup infrastructure — a layer between the source Veeam Data Mover and target Veeam Data Mover. The data flow goes from the source host or off-host backup proxy over a pair of WAN accelerators to the target host.
To replicate VMs over WAN accelerators, you must deploy a WAN accelerator at each end of the WAN link:
- Source WAN accelerator must be deployed in the source site. The source WAN accelerator must have access to the backup server, source host or off-host backup proxy and target WAN accelerator.
- Target WAN accelerator must be deployed in the target site. The target WAN accelerator must have access to the backup server, source WAN accelerator and target host.