A single SharePoint Task in the Enterprise Vault site can archive several virtual SharePoint Servers or SharePoint site collections, but if required you can configure multiple SharePoint Tasks on an Enterprise Vault Server. In addition to the SharePoint Task on the Enterprise Vault Server, you need to install Enterprise Vault SharePoint components on each SharePoint Server computer that is to be archived.

For users to be able to use the Archive Search Web Part, this also needs to be installed on each SharePoint Server computer.