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I need to clone 2 TB ext esata drives maybe 10 at a time what platform and software and hardware would you sugguest?

I would like to keep it a stand lone system.  But unsure what products would be the best.  Again these are ext. 2TB esata drives.  I would like them to all be writing all the same time.  The master would also be the same 2TB ext. drive.   Could you provide me with hardware and software to complete this task?  Could you also give me an estimate on the time it would take to create these 10, 2TB drives.  Thank you so much.