Documentdb Backup Using Lambda Function

I'm trying to take backup of documentDB using Lambda. I am able to take backup in S3 bucket as json file using below code but i have few concern where i need expert advice. Using

Solution 1:

Another approach would be to programmatically use mongodump: https://docs.aws.amazon.com/documentdb/latest/developerguide/backup_restore-dump_restore_import_export_data.html