External hdd backup alternatives???

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I decided to try out this new device called a NDAS (no not an NAS) but an NDAS. Network Direct Attached Storage.  Anyway it says it is the fastest method of transferring data.  I have tried a direct connection through a gig lan and it transferred 35GB of info in an 8 hour period.  I then hooked up an external hdd through esata and it did 35GB in less than 5 minutes.  Can anyone explain what is happening?  Am I doing something wrong?  Also, this hdd runs at 52 idle in this enclosure and 35 in others.