How to backup Gmail data to Google Cloud storage bucket

You could backup Gmail data as an archive to Google Cloud storage. To do the export, you can use Apps Script.

Below is a sample code that you can use to set up the data export:

function backupGmail() {
  // Replace BUCKET_NAME with the name of your Cloud Storage bucket
  var bucketName = 'BUCKET_NAME';

  // Replace FOLDER_NAME with the name of the folder where you want to store the backup
  var folderName = 'FOLDER_NAME';

  // Replace LABEL_NAME with the name of the Gmail label that you want to back up
  var labelName = 'LABEL_NAME';

  // Create a new Cloud Storage bucket if it doesn't already exist
  var bucket = getBucket_(bucketName);

  // Create a new folder in the bucket if it doesn't already exist
  var folder = getFolder_(bucket, folderName);

  // Get the Gmail label that you want to back up
  var label = GmailApp.getUserLabelByName(labelName);

  // Get the threads in the label
  var threads = label.getThreads();

  // Iterate through the threads and save the messages to Cloud Storage
  for (var i = 0; i < threads.length; i++) {
    var thread = threads[i];
    var messages = thread.getMessages();

    for (var j = 0; j < messages.length; j++) {
      var message = messages[j];
      var subject = message.getSubject();
      var timestamp = message.getDate().getTime();
      var fileName = subject + '_' + timestamp + '.eml';
      var file = folder.createFile(fileName, message.getRawContent());
    }
  }
}

// Returns a Cloud Storage bucket
function getBucket_(bucketName) {
  var bucket = Storage.Bucket.get(bucketName);

  if (bucket == null) {
    bucket = Storage.newBucket(bucketName);
  }

  return bucket;
}

// Returns a Cloud Storage folder
function getFolder_(bucket, folderName) {
  var folder = bucket.getFilesByName(folderName).next();

  if (folder == null) {
    folder = bucket.createFolder(folderName);
  }

  return folder;
}

To use this script, you will need to do the following:

1. Replace BUCKET_NAME with the name of your Cloud Storage bucket.
2. Replace FOLDER_NAME with the name of the folder where you want to store the backup.
3. Replace LABEL_NAME with the name of the Gmail label that you want to back up.

Once you have made these changes, you can run the script by going to the Apps Script editor and clicking the “Run” button. The script will create a backup of the messages in the specified Gmail label and save them to the specified folder in your Cloud Storage bucket.