diff --git a/upgrade-mattermost.sh b/upgrade-mattermost.sh
index 6badb49..2efa3eb 100755
--- a/upgrade-mattermost.sh
+++ b/upgrade-mattermost.sh
@@ -18,6 +18,21 @@ backup_date="$(date +%Y-%m-%d-%H%M)"
 
 clean_up() {
 
+   if [[ -f "$_backup_crontab_file" ]]; then
+
+      echononl "(Re)Install previously saved crontab from '$_backup_crontab_file'.."
+
+      crontab $_backup_crontab_file >> $log_file 2>&1
+
+      if [[ $? -eq 0 ]]; then
+         echo_ok
+      else
+         echo_failed
+         error "$(cat $log_file)"
+      fi
+
+   fi
+
    # Perform program exit housekeeping
    rm -rf "$LOCK_DIR"
    blank_line
@@ -504,6 +519,29 @@ else
    echo_skipped
 fi
 
+
+# - Deaktiviere Cronjobs
+# -
+_backup_crontab_file=/tmp/crontab_root.${backup_date}
+echononl "Backup Crontab to '$_backup_crontab_file'"
+crontab -l > $_backup_crontab_file 2> $log_file
+if [[ $? -eq 0 ]]; then
+   echo_ok
+else
+   echo_failed
+   fatal "$(cat $log_file)"
+fi
+
+echononl "Remove crontab for root.."
+crontab -r > $log_file 2>&1
+if [[ $? -eq 0 ]]; then
+   echo_ok
+else
+   echo_failed
+   fatal "$(cat $log_file)"
+fi
+
+
 echononl "Extract the Mattermost Server files into TMP directory.."
 tar  -xf ${working_dir}/mattermost-${MM_NEW_VERSION}-linux-amd64.tar.gz \
    -C ${MATTERMOST_TMP_DIR} --transform='s,^[^/]\+,\0-upgrade,'