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In theory, the power available on the back USB 3.0 connectors during S3 should be the same is it is in S0, namely 900mA (4.5W). The front ports differ slightly; while the blue connector provides the same 900mA, the orange (Charging Port) connector provides 2.4A (12W).
If your hub is independently powered, you should have no problems. If everything has to be power by a USB 3.0 connector on the NUC, you are not going to be able to do this. The UJ-272 requires up to 1.6A - which means two USB 3.0 connectors - all by itself).