Please use an off-the-shelf USB3 / Thunderbolt 2.5" Sata adapter. They are low cost, enable very fast read speeds of 200 / 375 Mbytes/sec (respectively).
Note that the drive offload time is heavily dependent on the SATA interface and the hard drive RAID bandwidth.
Two we recommend:
Thunderbolt: Seagate GoFlex Model STAE128 or STAE129
USB 2.0/3.0: Seagate GoFlex Model STAE104
Calvary USB 3.0 Adapter: Model CAUSM2001
An ExpressCard 34 to USB 3.0 adapter may be required for full USB 3.0 compatibility. However, USB 2.0 works fine to copy firmware updates to the SSD.