The thing is you can save money by building one yourself. Order a drive encloser then the hard drive you want.
I have 4 drive enclosers,
1 old school ATA, ( $20 )
1 SATA ( $30)
1 for older laptop drives ( $30).
Then my newest is an off the shelf 1 TB. I paid over $100 as it contains a HD.
So I keep all my old drives, I never erase them, I replace my drives after a min 2 years of use and put them on the shelf. It's cool as I have working 8 GIG drives ( 1997?) up there.
I only have one drive in my laptop that I use for recording live sessions. ( LenovoT420) I see no reason to stream audio to a second drive while recording. I dump the Sonar folder I created for the session to the 1 T drive imediatly and then transfer to my Desktop DAW to edit.
This creats 3 copies of every session. I also routinly backup the edited versions to the Desktops data drive so that makes 4.
That's interesting about the docking system, not sure if mine has that?? have to look later. But I bet they want a handsome coin for it.