Can you help me build a website architecture for new company?

Tony’s Chips has recently been sold to a new independent company. The new company has hired you to manage a project that will move the old Website from an externally hosted solution to an internal one. The company’s leadership is very concerned about redundancy for their site, insisting that a back-up site be available as a failover in case the main site goes down. In addition, they want the site redesigned to allow customers to order products online. 

The above description is just a little bit about the assignment.  I will post the actual word document so you can see what's all required for this assignment.   If you have any questions about the assignment, please contact me soon as possible.