Yes!
This was a requirement for Thunderbolt compatibility!
The Quantum has 2 Thunderbolt ports, therefore you can connect Thunderbolt Hard Drives Up Stream or Down Stream.
For example you can connect a Startech Thunderbolt 2 HDD to your System, then connect Quantum to that, and then another Thunderbolt device on the second port of the Quantum. Up to 7 devices total are supported in a single Thunderbolt 2 Chain, 4 of which can be Quantum Interfaces!