Can easily happen when no one's monitoring i guess.

N Korea has proven track record of hacking attack.

http://arstechnica.com/security/2013/07/hard-drive-wiping-ma...

A few years ago, N korean hackers go into a bank (IBM in S Korea helped maintain/secure it) and wiped their primary database AND standby backup database. By the time they realized what was happening, even the backup site off useless.

Others have remarked that a digital production house like Sony routinely moves dozens of terabytes of video per hour over its network, and outbound to digital projection theaters.