AWS Lambda to create a RDS Sanpshot

import boto3
import datetime

def lambda_handler(event, context):
    client = boto3.client('rds')
    response = client.describe_db_instances()
    for dba in response['DBInstances']:
      backup_name = 'backup-' + (dba['DBInstanceIdentifier'] + '-%s') % datetime.datetime.now().strftime("%y-%m-%d-%H-%M")
      client.create_db_snapshot(
              DBInstanceIdentifier=dba['DBInstanceIdentifier'],
              DBSnapshotIdentifier= backup_name,
              Tags=[
                  {
                      'Key': 'BackupType',
                      'Value': 'long-term'
                  },
              ]
          )
      print(backup_name+ "Snapshot Created")