I found on the forum
… The _ My Book Live , My Book World Edition (White Light), and My Book World Edition II (White Light)_ drives can now be used with the Time Machine backup application, built into Mac OSX 10.5.x (Leopard), 10.6.x (Snow Leopard), and 10.7.x (Lion). …
Does anybody know whether WD will come out with an update to also be able to use 10.8.x (Mountain Lion) Time Machine with the My Book World Edition II , and if so, when ?
Many thanks in advance