Resources to set up a local YUM repository RHEL 5.9

Hello,

I need to set up a machine with a local YUM repo, following the this article: https://access.redhat.com/site/solutions/23016.

This machine will be the main repository for the "rhel-x86_64-server-5" channel, so the rest of the machines will use it.
Im wondering which are the needed HW resources for this machine. Mainly RAM and CPU but specially storage.

¿How can I know the size of the complete "rhel-x86_64-server-5" repo? ¿20Gb? ¿50Gb?

Thanks for your time.