The hot site alternate environment is a dedicated, mirrored, synchronized copy of mission-critical data and infrastructure. The environment is always on, always ready and always available for fail-over. Once in disaster mode, you can continue to run your business and access your data and email remotely via a remote Terminal Services web portal.
The "warm site" solution is For applications and data that can accept several hours for the disaster recovery process to complete.
iVault's "cold" site ensures that you have the required infrastructure to support your operations.