OS 10.4.10 updater

I'm wondering if I can back off a version in my OS. Can I remove 10.4.10 and go back to, say, 10.4.7? I'm having trouble with our main pagination software and would like to take one of our machines and knock the OS down a few versions, then test the software on that machine.

Is this even possible?

You have to reinstall the OS, thats the only way to do it, unless you have a backup of a previous version.

I'm planning on upgrading from 10.4.9 to 10.4.10. But the overwhelming response to .10 update is not very encouraging. So how do I take a backup of my system in case the update gives me a problem? I don't want to go through a reinstall...