I love CrashPlan. It's been quietly backing up all my machines for the last couple years.
Lately though, just as quietly, it was crushing my MacBook. The background process silently crashes and CPU usage spikes. It wasn't backing up, I couldn't connect to it with the client interface, and it was killing performance.
Irfan Hafiz wrote up a solution at After Hours Projects.
Worked for me. Check it out.
⚛ April 11 2013.