Google Apps Script to Copy Folder Recursively

copy_files.gs

/**
This is a code of Google Apps Script for copying google drive folder content to other folder.

## Which situation the code resolve.

Google doesn't allow to move folder content to other folder which is managed by
other organization according to the policy of the GSUITE organization.
And, Google doesn't allow to change the content owner to the user in other
organizations.

For example, [email protected] can not move the folder to
shared folder managed by a GSUITE organization.
And, [email protected] can not change owner to the user in
a GSUITE user.

Even in such situation, a user can read the folder content so the user can
copy the content.

This script copies the folder to other folder recursively,
even if the destination folder is accessible and managed by other GSUITE
organization.

## Why it is created.

There is a webpage to copy a folder recursively but
the user in a GSUITE organization is sometimes prohibited
to use the script managed by others.
*/

function myFunction() {
  // put source folder ID.
  const fromFolder = DriveApp.getFolderById('1234567ABCDEFGHIJKLMNOPQRSTUVWXYZ')
  // put destination folder ID.
  const toFolder = DriveApp.getFolderById('1234567abcdefghijklmnopqrstuvwxyz')
  // copy the folder content recursively.
  copy(fromFolder, toFolder)
}

function copy(fromFolder, toFolder) {
  // copy files
  var files = fromFolder.getFiles()
  while (files.hasNext()) {
    var file = files.next();
    var newFile = file.makeCopy(toFolder)
    newFile.setName(file.getName())
  }

  // copy folders
  var folders = fromFolder.getFolders()
  while (folders.hasNext()) {
    var folder = folders.next()
    var newFolder = toFolder.createFolder(folder.getName())
    copy(folder, newFolder)
  }
}

@tomasvlk84
This script is quite old, so I'm unsure if it still works as intended.
Copying all shared files seems to be a different requirement.

Microsoft Copilot says:

function copySharedFiles() {
  // Get the folder where you want to copy the files
  var destinationFolder = DriveApp.getFolderById('DESTINATION_FOLDER_ID');
  
  // Get the files in the Drive
  var files = DriveApp.getFiles();
  
  // Iterate through the files
  while (files.hasNext()) {
    var file = files.next();
    
    // Check if the file is owned by someone else
    if (file.getOwner().getEmail() !== Session.getActiveUser().getEmail()) {
      // Copy the file to the destination folder
      file.makeCopy(destinationFolder);
    }
  }
}