[Anderkent]

There's nothing 'just' about backuping 25 petabytes of data. Even taking the ridiculous idea of burning it on blu-rays/dvds, for which I don't even want to think about manpower and hardware costs (do you expect their servers to have bluray burners?), the raw disks would cost, at say 50 pence per 25GB disk, 500k, and burning the 1000000 disks using 100 blu-ray equipped servers would take ~500 hours. All the while someone has to shuffle the disks every half an hour.

Oh, and then you have to store them somewhere.

Even tape storage would be extremely expensive for this, which is why Carpathia is asking for assistance.