Hm, the wiki page doesn't seem to be complete... what about postfix config files? spamassassin, cluebringer, possible SSL certificates?
I'm interested in the backup as well / I think you need to backup also AT LEAST following files:
/etc/amavis/conf.d/50-user (amavis custom configuration)
/etc/dovecot/dovecot.conf (imap/pop3/sieve server setup)
/etc/postfix/main.cf (postfix configuration)
/etc/spamassasin/local.cf (spamassassin customizations)
(optional) /etc/ssl/private/YOURDOMAIN.key (your purchased private SSL key)
(optional) /etc/ssl/certs/YOURDOMAIN.crt (your purchased public SSL key)
(optional) DB dump for bayesian data if you switched to DB backend
(optional) /etc/postfix/pgsql/* (possibly customized map queries)I run the iRedMail in virtual container so the firewalling is done on the host... is there anything more?
Then install THE SAME VERSION of iRedMail you was using before restore: