What is folder duplication and how does it differ from file duplication

[Jasper]

The concept seems kinda wonky to me. Could someone explain it for me?

[Christopher (Drashna)]

I'm guessing that you mean "Pool File Duplication" vs "Folder Duplication".

 

The difference is the folder.  The way that duplication settings are stored is that it can't "normally" be saved on the root folder of the drive.   So, we have this option.   

 

That said, enabling Pool File Duplication will enable duplication on the ENTIRE pool, unless explicitly specified per folder. 

 

 

This is covered a bit here, as well:

http://stablebit.com/Support/DrivePool/2.X/Manual?Section=File%20Protection