--- a/src/goodjava/lucene/backup/Backup.java	Sun Jun 26 14:40:08 2022 -0600
+++ b/src/goodjava/lucene/backup/Backup.java	Mon Jun 27 18:36:56 2022 -0600
@@ -26,14 +26,20 @@
 
 	private final File dir;
 	private final File indexFile;
+	private boolean updated = false;
 
 	Backup(File dir) {
 		this.dir = dir;
 		this.indexFile = new File(dir,"index.json");
-		dir.setLastModified(System.currentTimeMillis());
 	}
 
 	void handle(RpcServer rpc,RpcCall call) {
+		synchronized(this) {
+			if( !updated ) {
+				dir.setLastModified(System.currentTimeMillis());
+				updated = true;
+			}
+		}
 		try {
 			IoUtils.mkdirs(dir);
 			if( call.cmd.equals("zip") ) {
@@ -48,7 +54,7 @@
 
 	private static final RpcResult OK = new RpcResult(new Object[]{"ok"});
 
-	synchronized void handle2(RpcServer rpc,RpcCall call) throws IOException {
+	private synchronized void handle2(RpcServer rpc,RpcCall call) throws IOException {
 		//logger.info(call.cmd+" "+Arrays.asList(call.args));
 		String fileName = null;
 		if( call.cmd.equals("check") ) {
@@ -125,7 +131,7 @@
 		rpc.write(result);
 	}
 
-	void handleZip(RpcServer rpc) throws IOException {
+	private void handleZip(RpcServer rpc) throws IOException {
 		File zip = File.createTempFile("luan_",".zip");
 		IoUtils.delete(zip);
 		String cmd = "zip " + zip + " *";
@@ -139,4 +145,17 @@
 		IoUtils.delete(zip);
 	}
 
+	synchronized void copyTo(File dirTo) throws IOException {
+		IoUtils.mkdirs(dirTo);
+		for( File f : dir.listFiles() ) {
+			String name = f.getName();
+			File to = new File(dirTo,name);
+			if( name.equals("index.json") ) {
+				IoUtils.copy(f,to);
+			} else {
+				IoUtils.link(f,to);
+			}
+		}
+	}
+
 }