Once I've upgraded from 8.6 to 9.2.2, can I go back to OS 8.6?

I have a Blue and White G3 running OS 8.6, and I have to upgrade it to 9.2.2 but I want to know if I can go back to 8.6 if I need to?
Powerbook G4 15.2" 1.67 GHz 512MB   Mac OS X (10.4.2)   iPod Video 30GB White

Yes you can.
The easier - and safer - way would be to manually copy the 8.6 System Folder before upgrading…
The official way would be to make the upgrade and later to simply reinstall 8.6…
If you go the reinstallation route, it will complain because the current System Folder has a higher version, but you sidestep that by clicking the installer's Option button and choosing Clean System. That will rename 9.2.2 as Previous System Folder and preserve it otherwise intact, while adding whichever version your installer had… then update that, which will still leave 9.2.2 alone.
Either way, you wind up with two System Folders and can either choose between them with Startup Disk, or Trash one…
Please remember, you can use either version for a pure, bootable OS, but only the 9.2.2 for Classic over X

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