diff --git a/install_amavis.sh b/install_amavis.sh
index 9a279ae..0a8a660 100755
--- a/install_amavis.sh
+++ b/install_amavis.sh
@@ -3105,6 +3105,28 @@ if $INSTALL_CLAMAV_UNOFFICIAL_SIGS ; then
       echo_skipped
    fi
 
+   echononl "   Backup directory '/etc/clamav-unofficial-sigs' .."
+   if [[ -d "/etc/clamav-unofficial-sigs" ]]; then
+      mv "/etc/clamav-unofficial-sigs" "/etc/clamav-unofficial-sigs.BAK.${backup_date}" > $tmp_err_msg 2>&1
+      if [[ $? -eq 0 ]] ; then
+         echo_ok
+      else
+         echo_failed
+         error "$(cat $tmp_err_msg)"
+
+         echononl "continue anyway [yes/no]: "
+         read OK
+         OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+         while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+            echononl "Wrong entry! - repeat [yes/nno]: "
+            read OK
+         done
+         [[ $OK = "yes" ]] || fatal "Abbruch durch User"
+      fi
+   else
+      echo_skipped
+   fi
+
 
    _create_dirs="/var/log/clamav-unofficial-sigs /etc/clamav-unofficial-sigs"
    for _create_dir in $_create_dirs ; do