diff --git a/routes/routes-application.js b/routes/routes-application.js
index da03a7ac..677ca452 100644
--- a/routes/routes-application.js
+++ b/routes/routes-application.js
@@ -1591,7 +1591,14 @@ router.post('/gc/duplicateRundown', spxAuth.CheckLogin, async (req, res) => {
   let filename = req.body.filename;
   let filerefe = path.normalize(path.join(config.general.dataroot,foldname, 'data', filename));
   try {
-    spx.duplicateFile(filerefe, ' copy') ;
+    const {path, copyNum} = await spx.duplicateFile(filerefe);
+
+    // for each template in the duplicated rundown, append "_" to the itemID to avoid conflicts with the old rundown
+    const newRundown = spx.GetJsonData(path)
+    const appendString = `_copy${copyNum || 1}`
+    newRundown?.templates?.forEach((_, index) => newRundown.templates[index].itemID += appendString)
+    await spx.writeFile(path,newRundown);
+    
     res.status(200).send('Item duplicated.'); // ok 200 AJAX RESPONSE
   } catch (error) {
     let errmsg = 'Server error in /gc/duplicateRundown [' + error + ']';
diff --git a/utils/spx_server_functions.js b/utils/spx_server_functions.js
index ba05511d..9c613523 100644
--- a/utils/spx_server_functions.js
+++ b/utils/spx_server_functions.js
@@ -118,25 +118,43 @@ module.exports = {
     }
   }, // checkServerConnections
 
-  duplicateFile: function (fileRefe, suffix) {
-    // TODO: Tämä on kesken!
-    try {
-      return new Promise(resolve => {
-        let fldrname = path.dirname(fileRefe);
-        let extename = path.extname(fileRefe);
-        let basename = path.basename(fileRefe, extename);
-        let copyfile =  path.normalize(path.join(fldrname, basename + suffix + extename));
-        fs.copyFile(fileRefe, copyfile, (err) => {
-            if (err) throw err;
-            logger.info('Rundown file ' + fileRefe + ' was copied to ' + copyfile + '.');
-            resolve()
-            return true
-          });
-      })
-    } catch (error) {
-      logger.error('spx.duplicateFile - Error while duplicating: ' + fileRefe + ': ' + error);    
-      return false
+  duplicateFile: function (fileRefe, suffix = ' - Copy') {
+    const fldrname = path.dirname(fileRefe);
+    const extename = path.extname(fileRefe);
+    const basename = path.basename(fileRefe, extename);
+    let copyNum
+
+    const createCopyPath = (name) => {
+      const copyFilePath =  path.normalize(path.join(fldrname, `${name}${extename}`));
+
+      const { groups } = /\((?<existingCopyNum>[0-9]+)\)$/.exec(name) ?? {};
+      const { existingCopyNum } = groups ?? {};      
+      
+      if (fs.existsSync(copyFilePath)) {
+        return createCopyPath(
+          existingCopyNum
+          ? name.replace(/^(.*) \(([0-9]+)\)$/, `$1 (${Number(existingCopyNum) + 1})`)
+          : `${name} (2)`)
+      } else {
+        copyNum = existingCopyNum
+        return copyFilePath
+      }
     }
+
+    return new Promise((resolve, reject) => {
+      try {
+        const copyPath = createCopyPath(`${basename}${suffix}`)
+
+        fs.copyFile(fileRefe, copyPath, (err) => {
+          if (err) throw err;
+          logger.info('Rundown file ' + fileRefe + ' was copied to ' + copyPath + '.');
+          resolve({path: copyPath, copyNum});
+        });
+      } catch (error) {
+        logger.error('spx.duplicateFile - Error while duplicating: ' + fileRefe + ': ' + error);    
+        reject();
+      }
+    })
   }, // duplicateFile
  
   fileNameFromPath: function (filepath) {