And if Apple sells 200,000 copies of Lion the first day, that's 800TB on the network. That's the puzzle - how can the network be good enough for Apple's customers, but not for Apple itself?
The 300GB size, if true, would mean that Apple is being very old-fashioned with their store kits. The 300GB came from assuming a 50GB install, and 6 different copies of it for different machines. It would be dumb to multiply by 6 - instead ship an SIS (single instance store) backup image so that no files are duplicated in the network/FedEx image. An SIS backup image would probably weigh in around 20 GB or less with compression - less than 2 hours on a T3.
Also,
this post suggests that an Apple store has a much faster than T3 link.
Not sure where this comment is directed.
Someone has to create the HDs, and if there are problems re-create them. Using the network would be more flexible.
Again, flexibility. If there's a problem, or the 10.7.1 patch, they need to build new disks, clone them, ship them. Faster and simpler to put the SIS backup image on the network.