It could be that a job cannot delete temporary files. For example the Job scheduler_event_service (included base file config/scheduler_events.xml).
Temporary files are stored (Windows) e.g. c:\temp, c:\windows\temp. That depends on which value has the environment variable TMP or TEMP.
One solution is to delete the files with the houskeeping job JobSchedulerCleanupFiles (base file config/scheduler_automation_java.xml). See the documentation how to configure the job.
Example to customize the Job parameters to delete the temporary files of the scheduler_event_service Job older than 1 day:
<params>
<param name = "file_path" value = "c:\tmp"/>
<param name = "file_specification" value = "^sos.*"/>
<param name = "file_age" value = "24:00"/>
</params>