If it's not broke, don't fix it.
So for a long time, I hanged on to 10.4.9 on my PowerPC Dual 2.5 Ghz. I have too many programs here that I don't want to mess up if any upgrade goes wrong.
Don't get me wrong... I have other Macs in the house that have Leopard and Snow Leopard even! But my trusty and reliable G5 PPC is staying at 10.4.9
But lately, this 10.4.9 version is becoming a liability. There are software updates that I can't install (Omnisphere for example), or programs I purchased that I couldn't run on my own machine (and had to use another machine to run it...).
So tonight, I did an upgrade to 10.5.x. First, I CLONED my old drive using SuperDuper!. After cloning, I verified that the cloned drive is working by rebooting the machine and using the Firewire drive as the boot device.
It worked, and now confident I have a full working clone/ backup, I proceeded to upgrade to 10.5.
The upgrade was successful, no hitch whatsoever. I had to reinstall my Mail filtering program, and re-install network printers, and upgrade the Mail database. But other than that, everything works just fine.
All upgrades should be like this! Painless, easy, reliable! Not like PC Windows update that I liken to Russian Roulette.
This PowerPC G5 should serve me a few more years, though it's tempting to get one of the new PowerMac Intel G5s. We'll see.