On all of our Zimbra servers we have to date used only "local" storage (i.e. block devices).
A new customer for whom we are building a Zimbra system has requirements to keep backups for a long, long time.
We are being tempted by some of the very inexpensive 2TB NAS appliances out there, and so are wondering if we can't mount a Samba or NFS share from one of those devices to /opt/zimbra/backup.
As Dustin Hoffman was once asked: "Is it safe?"