On Sat, Oct 23, 2010 at 12:39:59AM +0800, sunhux G wrote: > >the queue starts empty (you are not adding old queue files to a > >queue that has received new queue files) you can restore, and > >then start Postfix > > We do backup once in the night but thing is the mails keep coming in > round the clock. So what we can get from the backup tape is not > usable because postfix is not shut down when backup is taken. > > So what would be a good backup strategy for a mail/postfix server > that runs round the clock? If a backup is taken only once per > night, it sounds like it's not a useable backup.
Back up your mail store (IMAP mailboxes, ...). Use a decent RAID sub-system for the mail spool, and don't bother backing it up. It just contains messages in transit, that are usually delivered within a few seconds of entering the queue. Replaying old queue files is not terribly useful. You can backup and restore a queue when decomissioning a machine, and moving the spool to new hardware. In most cases, draining the queue to the new host via SMTP is more sensible, if the two can run side-by-side. -- Viktor.