I thought I read somewhere that in 9.6, as long as the WAL log is available on disk or in the archive the replication server will provide that to the replication client, and my archive NFS mount didn’t have to be available to all replication clients.
Streaming replication will only read from the WAL files in the $PGDATA/pg_xlog directory. It will not read from archives. So, yes, you would need your NFS mount on the replica (or otherwise copy the archive files to the replica).
