Question is should I use an old Azio external e-SATA/USB2.0 HD case for backups, or give up and just buy a USB 3.0 Passport or similar? Is it worth it to then use a WD black drive for backup use, or is this overkill? (use green or blue). What type of HD does WD use in their Passports? Based on pricing, I would think not their black line?