Google Vault, Postini

Postini is an E-mail and Web security and archiving service owned by Google since 2007. It provides cloud computing services for filtering e-mail spam and (before it is delivered to a client's mail server), offers optional e-mail archiving, and protects client networks from web-borne malware.

Postini can be used as a additional backup and recovery system for your google apps. It can support the paid, as well as the free version. 

Postini is now replaced with the Google Vault server. Existing customers might have to migrate to google vault on next payment periode. 

Google Vault is included in the unlimited google apps service. 

(C) Symmetric Solutions 2014