I suppose replication and snapshots are out of the question for you? We run ZFS so snapshots are atomic and nearly instant. Thus we keep 14 days of daily snaps in our production pool for recovery purposes. In our setup the total of all the snaps is about a 50% overhead on the production data which seems cheap to us dunno about you. Helpdesk people can just run a utility while talking with the user and instantly restore a particular day of mail into a subfolder in the user mailbox. An offsite replica with larger/slower storage and more snapshots seems like it would fill most people's needs. Dunno about your data retention policy. Ours does not require us keeping it for years or anything so our mechanism are largely for disaster recovery both individual and system. We do run a weekly netbackup full on the weekends but could probably dispense with that if we ran into your problems. ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
