Use the "purge events" settings to set the maximum age of an event before it is purged from the database. Purging permanently deletes the event as well as any user comments associated with it.

Use the "purge report instances" settings to set the maximum age of a report instance before it is purged from the database. Purging permanently deletes the report instance. It is best to set this value as low as possible since reports can potentially consume a great deal of available storage space. Purging can be prevented by setting the "prevent purge" attribute on the report instance.