How to Copy a Google Drive Folder with All Subfolders
(Without Downloading to Your Machine)

1. The Flat Database Architecture of Google Drive

To understand why Google avoids native folder duplication, look at the Google Drive API data structure. Google Drive is not a traditional POSIX hierarchical file system. Instead, it is a flat NoSQL object database where every file and folder is an independent entity with a unique id:

To clone a folder structure, an application must recursively traverse every child folder, issue a files.create API call to create an identical folder shell, map the new parent ID, and then issue files.copy calls for every individual file. For a folder with 500 files across 20 subfolders, that requires over 520 discrete API transactions.

2. Evaluating the 4 Duplication Methods

3. DIY Google Apps Script Recursive Solution

For developers wanting to inspect the underlying Google Drive API logic, here is the recursive Google Apps Script:

function copyFolderRecursive(sourceFolderId, targetParentFolderId) {
  const source = DriveApp.getFolderById(sourceFolderId);
  const targetParent = DriveApp.getFolderById(targetParentFolderId);
  
  // 1. Create matching root shell in target destination
  const newFolder = targetParent.createFolder(source.getName() + " (Copy)");
  
  // 2. Copy all child files within the current directory
  const files = source.getFiles();
  while (files.hasNext()) {
    const file = files.next();
    file.makeCopy(file.getName(), newFolder);
  }
  
  // 3. Recursively traverse all child folders
  const subfolders = source.getFolders();
  while (subfolders.hasNext()) {
    const subfolder = subfolders.next();
    copyFolderRecursive(subfolder.getId(), newFolder.getId());
  }
}
            
            
            

                Note: This script will terminate with an "Exceeded maximum execution time" error on directories containing more than 200 items. For large nested hierarchies, client-side chunked processing is recommended.