When Seagate launched its PC/Mac Backup Plus offering that could safeguard not only your folders but your Facebook or Twitter content, too, it seemed like a nice idea. But conspicuously missing from the Mac side of that equation was a USB 3.0 port to hustle transfers along at a much less pedestrian 5 Gbps -- likely because until recently, no Macs directly supported it. Now, Seagate has launched a USB 3.0 version of the device for those shiny new Macbook Pro Retina and Air models that pack it, while offering the option to upgrade to Thunderbolt or FireWire 0 "as the need presents itself." Prices go from $110 for the 500GB model up to $180 for the 3TB version -- check the PR after the break to see the entire range.