Space for public folders

Hello,
I am worried that there is not enough space for my public folder replica move to Exchange 2010. Where does exchange store the public folders. Are they stored within the exchange mailbox databases or are they stored separately please?
Also how do I tell where the public folder master replica is please?
Cheers,
PenDraKon

in Exchange 2010 under database you will see A Dediczted database for PublicFolder
open the powershell and run this command
Get-PublicFolderDatabase | fl name, EdbFilePath
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