Table: Site properties lists default settings that are to apply across the Enterprise Vault Site.
Table: Site properties
Some of these can be overridden for individual archiving targets. For example, when archiving Exchange Servers, some of the defaults shown in Archive Settings can also be defined at provisioning group, Exchange Server and Enterprise Vault server levels. Consider the planned structure of your Site and decide where these defaults need to be defined.
Site properties enable you to have overall control of some aspects of archiving in the site, such as the schedule for archiving runs and whether users can delete items in archives. Archiving target and policy settings enable you tailor archiving for particular archiving targets or groups of users.
Site properties settings are described in the Administration Console help. Refer to this for more details about these settings.