I don't think you can point it directly at Glacier (if I'm wrong someone please let me know) but what you can do is to set "Lifecycle" options on your S3 bucket.

I have a folder in one of my buckets, for example, that I call "archive". I put in there anything I want to store on Glacier long-time. With my lifecycle settings, objects in that folder are automatically moved to Glacier after one day.