See -
Best Practices for configuring the number of content revisions to keep in Symantec Endpoint Protection Manager
http://www.symantec.com/business/support/index?page=content&id=TECH92225&actp=search&viewlocale=en_US&searchid=1314133522618
Top 10 Symantec Best Practices - Deploying Symantec Endpoint Protection Architecture
http://www.symantec.com/business/support/index?page=content&id=TECH92051&actp=search&viewlocale=en_US&searchid=1314133592185