diff --git a/dockerfile b/dockerfile
index 44950c2..6e22376 100644
--- a/dockerfile
+++ b/dockerfile
@@ -144,7 +144,7 @@ RUN chmod +x /docker-entrypoint.sh \
         
 
 # Setup data volumes
-VOLUME /srv/mail /certs /var/spool/spamassassin /backup /var/log
+VOLUME /srv/mail /certs /var/spool/postfix /var/spool/spamassassin /backup /var/log
 
 # Configure postfix
 RUN postconf -e "maillog_file=/var/log/postfix.log" \
diff --git a/include/bin/backup.sh b/include/bin/backup.sh
index fecd9db..7a4c8fa 100644
--- a/include/bin/backup.sh
+++ b/include/bin/backup.sh
@@ -9,6 +9,7 @@ start=$(date '+%s')
 
 includes=(/srv/mail)
 includes+=(/ssl)
+includes+=(/var/spool/postfix)
 includes+=(/var/spool/spamassassin)
 includes+=(/var/log)
 includes+=(/var/lib/amavis)