Should I uninstall old OS

Should I uninstall classic and or jaguar to free up space? If so how do I remove or uninstall?

What is the hard drive capacity and available free space on the Mac you want to install Tiger?
If you have no need for OS 9 and the Classic environment which will include any OS 9 applications, do the following to remove OS 9 and all OS 9 applications.
Open the folder named 'System Folder' (not the folder named 'System') and dump everything inside the System Folder into the trash and then empty the trash. Then delete the empty System Folder. Drag the folder named Applications (Mac OS 9) to the trash. Empty the trash and OS 9/Classic is gone.
If you have limited free hard drive space, this may not be enough.
If you have at least 3GB of free hard drive space (at least 5 - 10GB is better depending on how you install.
The Simple Upgrade method will require the least and the Archive & Install method (selecting preserve user and network settings) will require the most but either method will not require re-installing all of your existing applications.

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