There are many different ways in which you can deploy the Enterprise Vault components.
Factors that influence how you deploy Enterprise Vault include the following:
The amount of data you anticipate storing and how long you intend to retain the data.
The amount of computing resources you have at your disposal, that is, disk space as well as memory.
Whether you intend to use Enterprise Vault single instance storage.
Whether you are using offline storage, in which case the storage space you require for the vault stores will be reduced.