Little Snitch doesn't see CrashPlan network traffic

I'm running Little Snitch and CrashPlan on my 10.8.2 Mac.

I can see CrashPlan happily backing up over WiFi (the only connection I have) and Little Snitch monitor is not showing that traffic.

Is this a known or expected thing?

Have I somehow inadvertently told Little Snitch not to worry about Crash Plan?

Thx!