--- a/src/goodjava/lucene/backup/BackupIndexWriter.java	Sun Jun 12 18:48:01 2022 -0600
+++ b/src/goodjava/lucene/backup/BackupIndexWriter.java	Sun Jun 12 20:13:24 2022 -0600
@@ -32,20 +32,22 @@
 public final class BackupIndexWriter extends LoggingIndexWriter {
 	private static final Logger logger = LoggerFactory.getLogger(BackupIndexWriter.class);
 	public static String[] backupDomains;
+	private final String domain;
 	private final String name;
 	private final File dir;
 	private boolean isSyncPending = false;
 	private final ExecutorService exec = Executors.newSingleThreadExecutor();
 
-	public BackupIndexWriter(LuceneIndexWriter indexWriter,File logDir,long logTime,String name)
+	public BackupIndexWriter(LuceneIndexWriter indexWriter,File logDir,long logTime,String domain,String name)
 		throws IOException
 	{
 		super(indexWriter,logDir,logTime);
 		if( backupDomains == null )
 			throw new RuntimeException("must set backupDomains");
+		this.domain = domain;
 		this.name = name;
 		File f = new File(System.getProperty("java.io.tmpdir"));
-		dir = new File(f,"goodjava.lucene/"+name);
+		dir = new File(f,"goodjava.lucene/"+domain+"~"+name);
 		IoUtils.mkdirs(dir);
 	}
 
@@ -140,7 +142,7 @@
 		for( String backupDomain : backupDomains ) {
 			RpcClient rpc = BackupServer.rpcClient(backupDomain);
 			try {
-				RpcCall call = new RpcCall("login",name);
+				RpcCall call = new RpcCall("login",domain,name);
 				rpc.write(call);
 				rpc.read();
 				call = new RpcCall("check",logInfo);
@@ -186,7 +188,7 @@
 		}
 	}
 
-	public static BackupIndexWriter newWithRestore(LuceneIndexWriter indexWriter,File logDir,long logTime,String name)
+	public static BackupIndexWriter newWithRestore(LuceneIndexWriter indexWriter,File logDir,long logTime,String domain,String name)
 		throws IOException
 	{
 		if( !logDir.exists() ) {
@@ -194,7 +196,7 @@
 			try {
 				RpcCall call;
 				RpcResult result;
-				call = new RpcCall("exists",name);
+				call = new RpcCall("exists",domain,name);
 				rpc.write(call);
 				result = rpc.read();
 				boolean exists = (Boolean)result.returnValues[0];
@@ -202,7 +204,7 @@
 					logger.error("restoring "+logDir+" from backup");
 					File zip = File.createTempFile("luan_",".zip");
 					IoUtils.delete(zip);
-					call = new RpcCall("login",name);
+					call = new RpcCall("login",domain,name);
 					rpc.write(call);
 					rpc.read();
 					call = new RpcCall("zip");
@@ -222,7 +224,7 @@
 			}
 			rpc.close();
 		}
-		return new BackupIndexWriter(indexWriter,logDir,logTime,name);
+		return new BackupIndexWriter(indexWriter,logDir,logTime,domain,name);
 	}
 
 }