No, I don't think there's a way to see how it's being routed -- it's kind of up to the system how it resolves the mount.
The speed of your backup is going to be entirely dependent on how the requests -- which are quite random access -- are serviced by the device. I've seen pretty rapid service from higher end NAS drives such as the Infrant ReadyNAS NV+...
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--Dave Nanian
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