Recurring Transfer from S3 to GCS

I have a bucket on S3 that I'd like to backup to GCS, maybe even Nearline. From my research it seems I could use gsutil running on GCE to do so. What I'm not sure about is how to make this a recurring transfer. Maybe once a month it would check the S3 bucket and move anything new over to GCS. Is this possible with gsutil?

Thanks!