DAS (or NAS) with 10gb ethernet built in.?

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I would recommend Qnap TS-251D/TS-253Be/TS-453Be. These NAS feature PCI slot for 10GbE upgrades. Or you can simply get USB3 to 5GbE adapter instead of a 10G card. This would give a similar speed as eSATA. Just need to make sure you have fast enough drives inside.I hope this helps.