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If I move to a hosted IMAP mail server solution (e.g. Google Apps) is there a way to have an on-site back up of the mail server that can be used as a local mail archive and backup solution? What would I need to set up internally to achieve this?

A hosted solution is very attractive for a small company but With potential lose of internet connect I need my users to always get at their e-mail.

What are the options for such a hybrid mail solution?

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I'm using offlineimap + local dovecot server with some success for the same purpose.

However, note that offlineimap is not really meant for multiuser usage.

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It might not be designed for multiuser, but it does the job admirably. – womble Nov 26 '09 at 22:19

Setup an IMAP server on your side and run imapsync periodically.

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