Spaces backups

Hi DO!

So I've been using Spaces for a couple of months now, originally as part of your Hatch program beta. We will be using Spaces on our platform to provide high quality, licensed music downloads for creatives. This means our buckets will grow quite large with a typical download being > 50MB. It seems that Spaces can scale with us on this requirement but I was wondering about what would be the most cost effective backup solution.

Sure I could just duplicate the entire bucket in another region but that could get quite expensive. With knowledge of services out there like Amazon Glacier what is your suggestion for backup solutions now, and in the future?