From EV version 10.0.1 there is the ability to configure migration of EV archived data to Amazon S3 storage as a tier 3 solution. Within the Amazon solution data is stored within buckets which can be configured to be stored in various regions such as US Standard, US West (Oregon), US West (Northern California), EU (Ireland) and Asia Pacific (Singapore) to name a few. Currently Enterprise Vault only supports a configuration to the US region. This can be unacceptable to a business due to regulatory reasons.
This was expected behavior in versions prior to 10.0.4
This issue has been addressed in the following release:
Enterprise Vault 10.0.4 - Release Details
EV 10.0.1 and above