Copy a Public Folder

Good day,

I need to make backup for all my public folders but they have a lot emails 
mesagess. there are a way to copy the public folder and then convert to pst to 
use in the future.
if I try to move the mesagess the server work to slow and I have to cancel the 
operation.
please if someone have to do it.

best regards,
Héctor

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