Setup (5 min, one time only):
1. Go to script.google.com → New project → paste the GAS code (see below)
2. Click Deploy → New deployment → Web app
3. Execute as: Me · Who has access: Anyone → Deploy
4. Copy the Web App URL → paste into GAS_URL in your index.html → re-upload
5. First time: Google will ask to authorise — click Allow

Test connection ↓ Load from Drive

const FILE_NAME = 'trips_backup.json';

function doGet(e) {
  const action = e?.parameter?.action || 'load';
  if (action === 'ping') return json({ status: 'ok' });
  if (action === 'load') {
    const file = findFile();
    if (!file) return json({ status: 'ok', data: null });
    return json({ status: 'ok', data: JSON.parse(file.getBlob().getDataAsString()) });
  }
  return json({ status: 'error', error: 'Unknown action' });
}

function doPost(e) {
  try {
    const payload = JSON.parse(e.postData.contents);
    if (payload.action === 'save') {
      const content = JSON.stringify(payload.data, null, 2);
      let file = findFile();
      if (file) file.setContent(content);
      else DriveApp.createFile(FILE_NAME, content, MimeType.PLAIN_TEXT);
      return json({ status: 'ok' });
    }
  } catch(err) { return json({ status: 'error', error: err.message }); }
}

function findFile() {
  const files = DriveApp.getFilesByName(FILE_NAME);
  return files.hasNext() ? files.next() : null;
}

function json(obj) {
  return ContentService.createTextOutput(JSON.stringify(obj))
    .setMimeType(ContentService.MimeType.JSON);
}

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