How do you produce a report in vCops that contains historic data

I installed vCops 6.4 in November.

I was out of the office and our team ran some performance tests in December.

I would like to generate some reports of the Disk IOPs, CPU / Memory Usage, etc from a time frame in December.

However, i don't see the option in 6.4

What is the process to build a report by using historic data?

thanks