Backing up your data to a secondary hard disk is a critical first step to protecting your information assets. But to make certain your data is safe, use Offsite Copy. This feature copies your latest, complete recovery points to either a portable storage device, a remote server in your network, or to a remote FTP server.
Regardless of the method you use, storing copies of your recovery points at a remote location provides a crucial level of redundancy in the event that your office becomes inaccessible. Offsite Copy can double your data protection by ensuring that you have a remote copy.
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About using external drives as your Offsite Copy destination
About using a network server as your Offsite Copy destination