This worm attack shows how critical the tedious, boring janitorial sysadmin tasks really are.
Asset management: how many systems are infected that the admins didn't realize they had?
Patch management: this is not a zero-day. The patch is two months old.
Network segmentation: this worm spreads across flat networks. Segmented networks reduce harm.
Proper verified backups: if you backup and -V-E-R-I-F-Y- them, then the harm is greatly lessened.