Yes, the Aux copy is slow and we are planning on ordering a service from Amazon Web Services called Snowball (you order disk packs by the GB or TB). Disk is delivered to your location, files can be transferred (in this case a AUX copy run). The disk is then sent to Amazon, where it is loaded into a storage location for you to transfer your data (in this case another AUX copy). Beacuse it it not going over the wire like we are doing currently, I can get the AUX copy base line "caught up" and then the changes will run normally.
Yes, we are deduping.