Two OSX in a G4

I have a G4 tower with 4 internal drives. One drive has OSX Leopard installed and another has OSX Tiger. Is it overkill to have two OSX in one G4? Should I just reformat the OSX Tiger drive and use it as a storage drive? TIA

If you still have a use for Tiger, then feel free to keep it.
If you no longer use your Tiger boot partition, then reformat it and use it as a backup drive.  Maybe a bootable clone using SuperDuper or Carbon Copy Cloner so that it is updated every night.  Then if anything goes wrong with your boot drive, you can boot into your nightly clone and restore your boot drive from the nightly clone.
In my case, except for a few weeks after installing a major upgrade, I do not keep the older version. But I do maintain a nightly clone of my iMac which just recently saved my butt after my boot disk died.  After the boot drive was replaced, I just restored from the nightly clone and I was back in business.
As an alternative you can use Time Machine.  I also use Time Machine, but I like the nightly clone. It was worked well for me.

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