Is it an idea to transfer a backup of the 1st server to the 2nd (backup-server) using rdiff sheduled by cron?
After that you can create a sym link on the 2nd server between the /etc/postfix/virtualusertable (within the backup directory) and the /etc/postfix/virtualusertable and/or other necessary files.
Maybe this is not what you want, but it is just an idea.
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Hans
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