TalendJobServersFile directory - what can i remove to clear up space?

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TalendJobServersFile directory - what can i remove to clear up space?

What is necessary in the directory below?
/opt/tis/org.talend.remote.jobserver/TalendJobServersFiles/*
As mentioned in the posts below, the directory fills up rather quickly and I would like to know what is safe to clear out on a week or month rolling basis. Is there any documentation that explains what the purpose of the files in the archiveJobs, jobexecutions, and repository directories is?
http://www.talendforge.org/bugs/view.php?id=9109&nbn=6
http://www.talendforge.org/bugs/view.php?id=10414