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reading the White Paper of Zimbra Archiving and Discovery (ZAD)
gives me the impression an external mail server is required as
destination host (were the forked mail copies are sent to).
Now I head that ZAD is integral component of the NetworkEdition....
You can create archive accounts on your zimbra servers or choose to forward to an external non-zimbra server.
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Archive mailboxes are created using the CLI, zmarchivenconfig.
Note: Archive accounts you create are counted against the number of accounts you can create based on your ZCS license. Archive mailboxes are listed in the administration console along with the live accounts.
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To enable archive forwarding to a third-party archiving server type: zmarchiveconfig enable archive-address account-archive@offsiteserver.com archive-create false
Of course, if choosing to forward to a third-party/external archive machine then cross-mailbox search can't be used to the same effect - because the mail will not be stored in a location zimbra can query
If you're keeping it on the zimbra server you can make use of single-instance message storing & HSM (Hierarchical Storage Management) which involves moving data to other storage locations after x amount of time.
For instance: After 30 days messages move from your fast (and usually more expensive) SCSI disks, to a SATA array so that you can keep storage costs down.