The option "Job Check: Output file upload mode" can be used to instruct the Agent what to do with the output files from the executed Jobs.
By default is set to '0' that means all Job Output files will be transferred to the server.
Setting it to '1', instructs the Agent to just transfer failed jobs.
If Job Output files are not needed at all, setting the parameter to '2' will prevent all Job Output files from being transferred to the server.
This Configuration Policy parameter can be updated at DSM/Software Delivery/Agent/Job Check: Output file upload mode as can be seen in the following screenshot: