We performed some changes on the storage in both backup servers. The fast backup server is now doing 4,770 GB/hour data rates while it was doing 500gb/hour. The old backup server has been doing 318 gb/hour. We're watching to see how much of an improvement the old backup server gets as a result of these changes too.
The bottle neck is getting the data from the old backup server to the fast one - but this process is substantially faster than restoring directly from the old backup server which was only doing about 50gb/hour.