Backups are not so usefully for an email systems because of heavy traffic IMHO. The best backup solution is to use an RAID1 array for storing the mails and system files. Another good procedure (IMHO) is to use proxy's for SMTP and POP3 and store the emails on different machines. Example: accounts from A-G on machine 1,H-L on machine 2 etc ... If you want to have central storage for email you could use a central SAN solution. Those have redundant disk arrays but are much expensive.
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