How do I set up a failover group in my replication destination?

Simply add the address for each instance in the group to the destination, as shown below:

<Destination>
 <Name>amps-2</Name>
 <Topic>
 <Name>ORDER_STATE-Replication</Name>
 <MessageType>xml</MessageType>
 </Topic>
 <SyncType>sync</SyncType>
 <Transport>
 <Type>amps-replication</Type>
 <InetAddr>remote.example.com:19005</InetAddr>
 <InetAddr>remote-backup.example.com:19080</InetAddr>
 </Transport>
 <Passthrough>NYC</Passthrough>
</Destination> 

In this case, remote.example.com:19005 and remote-backup.example.com:19080 are the two instances in the failover group. When making a replication connection, AMPS first tries remote.example.com:19005; if that server is unreachable, AMPS tries remote-backup.example.com:19080.

For more details, see the AMPS User's Guide and the AMPS Configuration Guide.