defer zipWriter.Close()

	// Start by embedding cluster info.
	if b := getClusterMetaInfo(ctx); len(b) > 0 {
		internalLogIf(ctx, embedFileInZip(zipWriter, "cluster.info", b, 0o600))
	}

	// Profiles can be quite big, so we limit to max 16 concurrent downloads.
	ng := WithNPeersThrottled(len(sys.peerClients), 16)
	var writeMu sync.Mutex
	for i, client := range sys.peerClients {
		if client == nil {
			continue
		}