CrashPlan seems to like to tell me that backing-up is all done, even though it hasn't—and won't—done anything for days.

Their instructions involve:

1. Navigating to /usr/local/crashplan/bin/
2. Running ./CrashPlanEngine stop then ./CrashPlanEngine start
   • systemctl restart crashplan should also work?

You'll probably have to manually kill some process/es. You should get error messages with the PID, otherwise ps aux | grep crash to find things.

Then use sudo kill {PID}

It seems to help if I just change some setting related to back-up frequency.

• https://support.crashplan.com/Troubleshooting/Cannot_Connect_To_Background_Service
• https://support.crashplan.com/Troubleshooting/Stopping_And_Starting_The_CrashPlan_Service