Kolab and preferred backup method

[Markus Heller]

Dear Cyrus experts,

As you may know, the Cyrus imapd is used for the KOLAB open source groupware 
server. Unfortunately I have lost some emails during a test recently, so I 
was hit hard by the question how to back up the imapd.

What is the preferred and recommended backup strategy that allows zero 
downtime?

Thanks in advance,
Markus
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