This import workflow tutorial highlights the advantage of the using a Lexar Professional Workflow (HR2) to use as both a primary catalog hard drive and the back-up hard drive when using a laptop/notebook computer.
The Lexar hub can be purchased from Michaels Cameras in Melbourne (http://www.michaels.com.au)
An extended 1-hour tutorial can be purchased form https://www.markgaler.com/product/adobe-lightroom-for-beginners