All right folks. It took a while to get the guide up, but I finally finished creating my Apple Software Update mirror for Mac OS X 10.4 Tiger through 10.10 Yosemite. It takes about 300GB and is just flat files hosted by Apache. I want to shout out an open source project I used called Reposado that does all the heavy lifting of creating the mirror.
I created a guide for others to use. If you are like me and worried that one day Apple will shut off the Software Update Servers for our favorite PowerPC Macs, then you might want to get this up and running now before that happens.
https://github.com/jeffreybergier/Retro-Software-Update-Server