[galaxy-dev] How to Clean up Old Data

I'm trying to figure out how to reduce the data stored on the galaxy server. I came across this page and it looks like data will get deleted if the history element gets deleted but I can't tell if this happens automatically or if I need to cron these scripts: http://wiki.galaxyproject.org/Admin/Config/Performance/Purge%20Histories%20a... Is there anything else I can do to clean up unused data? Also is there a way a user can keep her history around as a record of what was done and be able to rerun it later, but still delete the actual data? Thanks, Greg