Restarting the CrashPlan service on the computer.
This is used to clear connection and cache corruption issues.
Navigate to CrashPlan on the computer and open it.
When at this screen you will either want to hit Command Option and C at the same time for a Mac device or Control Shift and C at the same time.
This will bring a list of commands you can make. From here you will want to type in Restart and hit Enter. After waiting for roughly 30 seconds open CrashPlan again and use the keystrokes above to enter the command line again. Then type Scan and hit Enter. This should clear Cache issues and some connection issues too.