To relieve our server of the storage crunch, I added a mirror of 2x1gb nearpoint SATA drives and then set them as the HSM. The main storage dropped significantly and I'm back up to a month of backups and the HSM is a bit less than half full.
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Culley
Mail | Dell 2950III | 2x Quad Core 5420 | 8gb RAM | 6x 146gb SAS RAID 0+1 | Red Hat 5.3 | Zimbra 6.0.10 Network Edition
Test | VMware ESXi Whitebox | Phenom II Black 3.2ghz | 12gb RAM | 6x 1tb SATA RAID 0+1 | CentOS 5.4 | FOSS, Not in use now |