Check the default settings configured in the Enterprise Vault site properties.
To review the default settings for the Enterprise Vault site
In the Administration Console, expand the contents of the left pane until the Enterprise Vault site is visible.
Right-click the Enterprise Vault site and then, on the shortcut menu, click Properties.
Alternatively, select the site and click the Review site properties button on the toolbar.
Click Help on any of the Site Properties screens for further information.
Site properties include the following settings. Note that you can override some of these at a lower level. For example, you can override the site archiving schedule for a particular task by setting the schedule in the task properties. The indexing level can also be set at policy and archive level and the default retention category can be set at policy level (and at Provisioning Group level for Exchange Server mailbox archiving).
Click Help on any of the site properties screens for further information.