Archiving e-mail

How do I archive e-mail folders on the My Book?  Is there any advantage to having e-mail archiving software to free up disk space on my hard drive?

Hi obceanian2014, that would depend on the email software that you are using. 

whatever you decide, if those are important files, have a backup.

Advantage… I do not see any, unless you are running out of space.

Local HD: faster access

Remote HD: slower