diff --git a/kiauh.sh b/kiauh.sh
index cc718d2..ebf6130 100755
--- a/kiauh.sh
+++ b/kiauh.sh
@@ -35,7 +35,6 @@ MAINSAIL_DIR=${HOME}/mainsail
 FLUIDD_DIR=${HOME}/fluidd
 #misc
 INI_FILE=${HOME}/.kiauh.ini
-BACKUP_DIR=${HOME}/kiauh-backups
 
 ### set github repos
 DMBUTYUGIN_REPO=https://github.com/dmbutyugin/klipper.git
diff --git a/scripts/backup.sh b/scripts/backup.sh
index e0f6901..97058fa 100755
--- a/scripts/backup.sh
+++ b/scripts/backup.sh
@@ -1,37 +1,53 @@
-check_for_backup_dir(){
-  if [ ! -d $BACKUP_DIR ]; then
+#!/bin/bash
+
+#=======================================================================#
+# Copyright (C) 2020 - 2022 Dominik Willner <th33xitus@gmail.com>       #
+#                                                                       #
+# This file is part of KIAUH - Klipper Installation And Update Helper   #
+# https://github.com/th33xitus/kiauh                                    #
+#                                                                       #
+# This file may be distributed under the terms of the GNU GPLv3 license #
+#=======================================================================#
+
+set -e
+
+### global variables
+BACKUP_DIR="${HOME}/kiauh-backups"
+
+function check_for_backup_dir(){
+  if [ ! -d "${BACKUP_DIR}" ]; then
     status_msg "Create KIAUH backup directory ..."
-    mkdir -p $BACKUP_DIR && ok_msg "Directory created!"
+    mkdir -p "${BACKUP_DIR}" && ok_msg "Directory created!"
   fi
 }
 
-toggle_backups(){
+function toggle_backups(){
   source_kiauh_ini
-  if [ "$backup_before_update" = "true" ]; then
-    sed -i '/backup_before_update=/s/true/false/' $INI_FILE
-    BB4U_STATUS="${green}[Enable]${default} backups before updating                  "
+  if [ "${backup_before_update}" = "true" ]; then
+    sed -i '/backup_before_update=/s/true/false/' "${INI_FILE}"
+    BB4U_STATUS="${green}[Enable]${white} backups before updating                  "
     CONFIRM_MSG=" Backups before updates are now >>> DISABLED <<< !"
   fi
-  if [ "$backup_before_update" = "false" ]; then
-    sed -i '/backup_before_update=/s/false/true/' $INI_FILE
-    BB4U_STATUS="${red}[Disable]${default} backups before updating                 "
+  if [ "${backup_before_update}" = "false" ]; then
+    sed -i '/backup_before_update=/s/false/true/' "${INI_FILE}"
+    BB4U_STATUS="${red}[Disable]${white} backups before updating                 "
     CONFIRM_MSG=" Backups before updates are now >>> ENABLED <<< !"
   fi
 }
 
-bb4u(){
+function bb4u(){
   source_kiauh_ini
-  if [ "$backup_before_update" = "true" ]; then
-    backup_$1
+  if [ "${backup_before_update}" = "true" ]; then
+    backup_"${1}"
   fi
 }
 
-read_bb4u_stat(){
+function read_bb4u_stat(){
   source_kiauh_ini
-  if [ ! "$backup_before_update" = "true" ]; then
-    BB4U_STATUS="${green}[Enable]${default} backups before updating                  "
+  if [ ! "${backup_before_update}" = "true" ]; then
+    BB4U_STATUS="${green}[Enable]${white} backups before updating                  "
   else
-    BB4U_STATUS="${red}[Disable]${default} backups before updating                 "
+    BB4U_STATUS="${red}[Disable]${white} backups before updating                 "
   fi
 }
 
@@ -39,28 +55,28 @@ read_bb4u_stat(){
 #******************************************************************************#
 ################################################################################
 
-backup_printer_cfg(){
+function backup_printer_cfg(){
   check_for_backup_dir
-  if [ -f $PRINTER_CFG ]; then
+  if [ -f "${PRINTER_CFG}" ]; then
     get_date
-    status_msg "Timestamp: $current_date"
+    status_msg "Timestamp: ${current_date}"
     status_msg "Create backup of printer.cfg ..."
-    cp $PRINTER_CFG $BACKUP_DIR/printer.cfg."$current_date".backup && ok_msg "Backup complete!"
+    cp "${PRINTER_CFG}" "${BACKUP_DIR}/printer.cfg.${current_date}.backup" && ok_msg "Backup complete!"
   else
     ok_msg "No printer.cfg found! Skipping backup ..."
   fi
 }
 
-backup_klipper_config_dir(){
+function backup_klipper_config_dir(){
   source_kiauh_ini
   check_for_backup_dir
-  if [ -d "$klipper_cfg_loc" ]; then
+  if [ -d "${klipper_cfg_loc}" ]; then
     get_date
-    status_msg "Timestamp: $current_date"
+    status_msg "Timestamp: ${current_date}"
     status_msg "Create backup of the Klipper config directory ..."
-    config_folder_name="$(echo "$klipper_cfg_loc" | rev | cut -d"/" -f1 | rev)"
-    mkdir -p $BACKUP_DIR/$config_folder_name/$current_date
-    cp -r "$klipper_cfg_loc" "$_" && ok_msg "Backup complete!"
+    config_folder_name="$(echo "${klipper_cfg_loc}" | rev | cut -d"/" -f1 | rev)"
+    mkdir -p "${BACKUP_DIR}/${config_folder_name}/${current_date}"
+    cp -r "${klipper_cfg_loc}" "${_}" && ok_msg "Backup complete!"
     echo
   else
     ok_msg "No config directory found! Skipping backup ..."
@@ -68,16 +84,16 @@ backup_klipper_config_dir(){
   fi
 }
 
-backup_moonraker_database(){
+function backup_moonraker_database(){
   check_for_backup_dir
   if ls -d ${HOME}/.moonraker_database* 2>/dev/null 1>&2; then
     get_date
-    status_msg "Timestamp: $current_date"
-    mkdir -p "$BACKUP_DIR/mr_db_backup/$current_date"
+    status_msg "Timestamp: ${current_date}"
+    mkdir -p "${BACKUP_DIR}/mr_db_backup/${current_date}"
     for database in $(ls -d ${HOME}/.moonraker_database*)
     do
-      status_msg "Create backup of $database ..."
-      cp -r $database "$BACKUP_DIR/mr_db_backup/$current_date"
+      status_msg "Create backup of ${database} ..."
+      cp -r "${database}" "${BACKUP_DIR}/mr_db_backup/${current_date}"
       ok_msg "Done!"
     done
     ok_msg "Backup complete!\n"
@@ -86,110 +102,110 @@ backup_moonraker_database(){
   fi
 }
 
-backup_klipper(){
-  if [ -d $KLIPPER_DIR ] && [ -d $KLIPPY_ENV ]; then
+function backup_klipper(){
+  if [ -d "${KLIPPER_DIR}" ] && [ -d "${KLIPPY_ENV}" ]; then
     status_msg "Creating Klipper backup ..."
     check_for_backup_dir
     get_date
-    status_msg "Timestamp: $current_date"
-    mkdir -p $BACKUP_DIR/klipper-backups/"$current_date"
-    cp -r $KLIPPER_DIR $_ && cp -r $KLIPPY_ENV $_ && ok_msg "Backup complete!"
+    status_msg "Timestamp: ${current_date}"
+    mkdir -p "${BACKUP_DIR}/klipper-backups/${current_date}"
+    cp -r "${KLIPPER_DIR}" "${_}" && cp -r "${KLIPPY_ENV}" "${_}" && ok_msg "Backup complete!"
   else
-    ERROR_MSG=" Can't backup klipper and/or klipper-env directory! Not found!"
+    print_error "Can't backup klipper and/or klipper-env directory! Not found!"
   fi
 }
 
-backup_dwc2(){
-  if [ -d $DWC2FK_DIR ] && [ -d $DWC_ENV_DIR ] && [ -d $DWC2_DIR ]; then
+function backup_dwc2(){
+  if [ -d "${DWC2FK_DIR}" ] && [ -d "${DWC_ENV_DIR}" ] && [ -d "${DWC2_DIR}" ]; then
     status_msg "Creating DWC2 Web UI backup ..."
     check_for_backup_dir
     get_date
-    status_msg "Timestamp: $current_date"
-    mkdir -p $BACKUP_DIR/dwc2-backups/"$current_date"
-    cp -r $DWC2FK_DIR $_ && cp -r $DWC_ENV_DIR $_ && cp -r $DWC2_DIR $_
+    status_msg "Timestamp: ${current_date}"
+    mkdir -p "${BACKUP_DIR}/dwc2-backups/${current_date}"
+    cp -r "${DWC2FK_DIR}" "${_}" && cp -r "${DWC_ENV_DIR}" "${_}" && cp -r "${DWC2_DIR}" "${_}"
     ok_msg "Backup complete!"
   else
-    ERROR_MSG=" Can't backup dwc2-for-klipper-socket and/or dwc2 directory!\n Not found!"
+    print_error "Can't backup dwc2-for-klipper-socket and/or dwc2 directory!\n Not found!"
   fi
 }
 
-backup_mainsail(){
-  if [ -d $MAINSAIL_DIR ]; then
+function backup_mainsail(){
+  if [ -d "${MAINSAIL_DIR}" ]; then
     status_msg "Creating Mainsail backup ..."
     check_for_backup_dir
     get_date
-    status_msg "Timestamp: $current_date"
-    mkdir -p $BACKUP_DIR/mainsail-backups/"$current_date"
-    cp -r $MAINSAIL_DIR $_ && ok_msg "Backup complete!"
+    status_msg "Timestamp: ${current_date}"
+    mkdir -p "${BACKUP_DIR}/mainsail-backups/${current_date}"
+    cp -r "${MAINSAIL_DIR}" "${_}" && ok_msg "Backup complete!"
   else
-    ERROR_MSG=" Can't backup mainsail directory! Not found!"
+    print_error "Can't backup mainsail directory! Not found!"
   fi
 }
 
-backup_fluidd(){
-  if [ -d $FLUIDD_DIR ]; then
+function backup_fluidd(){
+  if [ -d "${FLUIDD_DIR}" ]; then
     status_msg "Creating Fluidd backup ..."
     check_for_backup_dir
     get_date
-    status_msg "Timestamp: $current_date"
-    mkdir -p $BACKUP_DIR/fluidd-backups/"$current_date"
-    cp -r $FLUIDD_DIR $_ && ok_msg "Backup complete!"
+    status_msg "Timestamp: ${current_date}"
+    mkdir -p "${BACKUP_DIR}/fluidd-backups/${current_date}"
+    cp -r "${FLUIDD_DIR}" "${_}" && ok_msg "Backup complete!"
   else
-    ERROR_MSG=" Can't backup fluidd directory! Not found!"
+    print_error "Can't backup fluidd directory! Not found!"
   fi
 }
 
-backup_moonraker(){
-  if [ -d $MOONRAKER_DIR ] && [ -d $MOONRAKER_ENV ]; then
+function backup_moonraker(){
+  if [ -d "${MOONRAKER_DIR}" ] && [ -d "${MOONRAKER_ENV}" ]; then
     status_msg "Creating Moonraker backup ..."
     check_for_backup_dir
     get_date
-    status_msg "Timestamp: $current_date"
-    mkdir -p $BACKUP_DIR/moonraker-backups/"$current_date"
-    cp -r $MOONRAKER_DIR $_ && cp -r $MOONRAKER_ENV $_ && ok_msg "Backup complete!"
+    status_msg "Timestamp: ${current_date}"
+    mkdir -p "${BACKUP_DIR}/moonraker-backups/${current_date}"
+    cp -r "${MOONRAKER_DIR}" "${_}" && cp -r "${MOONRAKER_ENV}" "${_}" && ok_msg "Backup complete!"
   else
-    ERROR_MSG=" Can't backup moonraker and/or moonraker-env directory! Not found!"
+    print_error "Can't backup moonraker and/or moonraker-env directory! Not found!"
   fi
 }
 
-backup_octoprint(){
-  if [ -d $OCTOPRINT_DIR ] && [ -d $OCTOPRINT_CFG_DIR ]; then
+function backup_octoprint(){
+  if [ -d "${OCTOPRINT_DIR}" ] && [ -d "${OCTOPRINT_CFG_DIR}" ]; then
     status_msg "Creating OctoPrint backup ..."
     check_for_backup_dir
     get_date
-    status_msg "Timestamp: $current_date"
-    mkdir -p $BACKUP_DIR/octoprint-backups/"$current_date"
-    cp -r $OCTOPRINT_DIR $_ && cp -r $OCTOPRINT_CFG_DIR $_
+    status_msg "Timestamp: ${current_date}"
+    mkdir -p "${BACKUP_DIR}/octoprint-backups/${current_date}"
+    cp -r "${OCTOPRINT_DIR}" "${_}" && cp -r "${OCTOPRINT_CFG_DIR}" "${_}"
     ok_msg "Backup complete!"
   else
-    ERROR_MSG=" Can't backup OctoPrint and/or .octoprint directory!\n Not found!"
+    print_error "Can't backup OctoPrint and/or .octoprint directory!\n Not found!"
   fi
 }
 
-backup_klipperscreen(){
-  if [ -d $KLIPPERSCREEN_DIR ] ; then
+function backup_klipperscreen(){
+  if [ -d "${KLIPPERSCREEN_DIR}" ] ; then
     status_msg "Creating KlipperScreen backup ..."
     check_for_backup_dir
     get_date
-    status_msg "Timestamp: $current_date"
-    mkdir -p $BACKUP_DIR/klipperscreen-backups/"$current_date"
-    cp -r $KLIPPERSCREEN_DIR $_
+    status_msg "Timestamp: ${current_date}"
+    mkdir -p "${BACKUP_DIR}/klipperscreen-backups/${current_date}"
+    cp -r "${KLIPPERSCREEN_DIR}" "${_}"
     ok_msg "Backup complete!"
   else
-    ERROR_MSG=" Can't backup KlipperScreen directory!\n Not found!"
+    print_error "Can't backup KlipperScreen directory!\n Not found!"
   fi
 }
 
-backup_MoonrakerTelegramBot(){
-  if [ -d $MOONRAKER_TELEGRAM_BOT_DIR ] ; then
+function backup_MoonrakerTelegramBot(){
+  if [ -d "${MOONRAKER_TELEGRAM_BOT_DIR}" ] ; then
     status_msg "Creating MoonrakerTelegramBot backup ..."
     check_for_backup_dir
     get_date
-    status_msg "Timestamp: $current_date"
-    mkdir -p $BACKUP_DIR/MoonrakerTelegramBot-backups/"$current_date"
-    cp -r $MOONRAKER_TELEGRAM_BOT_DIR $_
+    status_msg "Timestamp: ${current_date}"
+    mkdir -p "${BACKUP_DIR}/MoonrakerTelegramBot-backups/${current_date}"
+    cp -r "${MOONRAKER_TELEGRAM_BOT_DIR}" "${_}"
     ok_msg "Backup complete!"
   else
-    ERROR_MSG=" Can't backup MoonrakerTelegramBot directory!\n Not found!"
+    print_error "Can't backup MoonrakerTelegramBot directory!\n Not found!"
   fi
 }