Azure Site Recovery (ASR) supports 1:1 and N:1 topologies. ASR does not support 1:N and N:N topologies.

1:1 = site-to-cloud replication.

N:1 = sites-to-cloud replication.

1:N, also known as fan-out, is defined as the same protected VM that can be replicated to multiple recovery sites.

N:1, also known as fan-in, is defined as protected VMs in multiple sites being replicated to a single recovery site.