Py-Backup/pyimage_ui/actions.py

# pyimage_ui/actions.py
import tkinter as tk
import os
import shutil
import threading
import datetime
import locale
from typing import Optional

from shared_libs.message import MessageDialog
from shared_libs.custom_file_dialog import CustomFileDialog
from pbp_app_config import AppConfig, Msg
from shared_libs.logger import app_logger
from shared_libs.common_tools import message_box_animation


class Actions:
    def __init__(self, app):
        self.app = app

    def _update_backup_type_controls(self):
        """
        Updates the state of the Full/Incremental backup radio buttons based on
        advanced settings and the content of the destination folder.
        This logic only applies to 'Computer' backups.
        """
        # Do nothing if the backup mode is not 'backup' or source is not 'Computer'
        if self.app.mode != 'backup' or self.app.left_canvas_data.get('folder') != "Computer":
            self.app.full_backup_cb.config(state="normal")
            self.app.incremental_cb.config(state="normal")
            return

        # Respect that advanced settings might have already disabled the controls
        # This check is based on the user's confirmation that this logic exists elsewhere
        if self.app.full_backup_cb.cget('state') == 'disabled':
            return

        # --- Standard Logic ---
        full_backup_exists = False
        if self.app.destination_path and os.path.isdir(self.app.destination_path):
            system_backups = self.app.backup_manager.list_system_backups(
                self.app.destination_path)
            for backup in system_backups:
                if backup.get('type') == 'Full':
                    full_backup_exists = True
                    break

        if full_backup_exists:
            # Case 1: A full backup exists. Allow user to choose, default to incremental.
            if not self.app.vollbackup_var.get():  # If user has not manually selected full backup
                self.app.vollbackup_var.set(False)
                self.app.inkrementell_var.set(True)
            self.app.full_backup_cb.config(state="normal")
            self.app.incremental_cb.config(state="normal")
            self.app.accurate_size_cb.config(
                state="normal")  # Enable accurate calc
        else:
            # Case 2: No full backup exists. Force a full backup.
            self.app.vollbackup_var.set(True)
            self.app.inkrementell_var.set(False)
            self.app.full_backup_cb.config(state="disabled")
            self.app.incremental_cb.config(state="disabled")
            self.app.accurate_size_cb.config(
                state="disabled")  # Disable accurate calc

    def handle_backup_type_change(self, changed_var_name):
        # This function is called when the user clicks on "Full" or "Incremental".
        # It enforces that only one can be selected and updates the accurate size checkbox accordingly.
        if changed_var_name == 'voll':
            if self.app.vollbackup_var.get():  # if "Full" was checked
                self.app.inkrementell_var.set(False)
        elif changed_var_name == 'inkrementell':
            if self.app.inkrementell_var.get():  # if "Incremental" was checked
                self.app.vollbackup_var.set(False)

        # Now, update the state of the accurate calculation checkbox
        if self.app.vollbackup_var.get():
            self.app.accurate_size_cb.config(state="disabled")
            self.app.genaue_berechnung_var.set(False)
        else:
            # Only enable if it's an incremental backup of the system
            if self.app.left_canvas_data.get('folder') == "Computer":
                self.app.accurate_size_cb.config(state="normal")
            else:
                self.app.accurate_size_cb.config(state="disabled")

    def handle_compression_change(self):
        if self.app.compressed_var.get():
            # Compression is enabled, force full backup
            self.app.vollbackup_var.set(True)
            self.app.inkrementell_var.set(False)
            self.app.full_backup_cb.config(state="disabled")
            self.app.incremental_cb.config(state="disabled")
            # Also disable accurate incremental size calculation, as it's irrelevant
            self.app.accurate_size_cb.config(state="disabled")
            self.app.genaue_berechnung_var.set(False)
        else:
            # Compression is disabled, restore normal logic
            self.app.full_backup_cb.config(state="normal")
            # The state of the incremental checkbox depends on whether a full backup exists
            self._update_backup_type_controls()

    def on_toggle_accurate_size_calc(self):
        # This method is called when the user clicks the "Genaue inkrem. Größe" checkbox.
        if not self.app.genaue_berechnung_var.get():
            # Box was unchecked by user, but this shouldn't happen if disabled.
            # Or it was unchecked automatically after a run. Do nothing.
            return

        # If a normal calculation is running, stop it.
        if self.app.calculation_thread and self.app.calculation_thread.is_alive():
            self.app.calculation_stop_event.set()
            app_logger.log("Stopping previous size calculation.")

        # --- Start the accurate calculation ---
        app_logger.log("Accurate incremental size calculation requested.")
        self.app.accurate_calculation_running = True
        # Lock the UI, keep Cancel enabled
        self._set_ui_state(False, keep_cancel_enabled=True)
        self.app.start_pause_button.config(text=Msg.STR["cancel_backup"])

        # Immediately clear the projection canvases
        self.app.drawing.reset_projection_canvases()

        # Update canvas to show it's calculating and start animation
        self.app.info_label.config(
            text=Msg.STR["please_wait"], foreground="#0078d7")
        self.app.task_progress.config(mode="indeterminate")
        self.app.task_progress.start()
        self.app.left_canvas_data.update({
            'size': Msg.STR["calculating_size"],
            'calculating': True,
        })
        self.app.drawing.start_backup_calculation_display()
        self.app.animated_icon.start()

        # Get folder path from the current canvas data
        folder_path = self.app.left_canvas_data.get('path_display')
        button_text = self.app.left_canvas_data.get('folder')

        if not folder_path or not button_text:
            app_logger.log(
                "Cannot start accurate calculation, source folder info missing.")
            self._set_ui_state(True)  # Unlock UI
            self.app.genaue_berechnung_var.set(False)  # Uncheck the box
            self.app.accurate_calculation_running = False
            self.app.animated_icon.stop("DISABLE")
            return

        def threaded_incremental_calc():
            status = 'failure'  # Default to failure
            size = 0
            try:
                exclude_file_paths = []
                if AppConfig.GENERATED_EXCLUDE_LIST_PATH.exists():
                    exclude_file_paths.append(
                        AppConfig.GENERATED_EXCLUDE_LIST_PATH)
                if AppConfig.USER_EXCLUDE_LIST_PATH.exists():
                    exclude_file_paths.append(AppConfig.USER_EXCLUDE_LIST_PATH)

                base_dest = self.app.destination_path
                correct_parent_dir = os.path.join(base_dest, "pybackup")
                dummy_dest_for_calc = os.path.join(
                    correct_parent_dir, "dummy_name")

                size = self.app.data_processing.get_incremental_backup_size(
                    source_path=folder_path,
                    dest_path=dummy_dest_for_calc,
                    is_system=True,
                    exclude_files=exclude_file_paths
                )
                # If rsync fails, size is 0, so status will be failure.
                status = 'success' if size > 0 else 'failure'
            except Exception as e:
                app_logger.log(f"Error during threaded_incremental_calc: {e}")
                status = 'failure'
            finally:
                # This message MUST be sent to unlock the UI and update the display.
                # It is now handled by the main data_processing queue.
                if self.app.accurate_calculation_running:  # Only post if not cancelled
                    self.app.queue.put(
                        (button_text, size, self.app.mode, 'accurate_incremental', status))

        self.app.calculation_thread = threading.Thread(
            target=threaded_incremental_calc)
        self.app.calculation_thread.daemon = True
        self.app.calculation_thread.start()

    def on_sidebar_button_click(self, button_text):
        if self.app.backup_is_running or self.app.accurate_calculation_running:
            app_logger.log(
                "Action blocked: Backup or accurate calculation is in progress.")
            return

        self.app.drawing.reset_projection_canvases()
        if not self.app.canvas_frame.winfo_viewable():
            self.app.navigation.toggle_mode(
                self.app.mode, trigger_calculation=False)

        self.app.log_window.clear_log()

        # Reverse map from translated UI string to canonical key
        REVERSE_FOLDER_MAP = {
            "Computer": "Computer",
            Msg.STR["cat_documents"]: "Documents",
            Msg.STR["cat_images"]: "Pictures",
            Msg.STR["cat_music"]: "Music",
            Msg.STR["cat_videos"]: "Videos",
        }
        canonical_key = REVERSE_FOLDER_MAP.get(button_text, button_text)

        folder_path = AppConfig.FOLDER_PATHS.get(canonical_key)

        if not folder_path or not folder_path.exists():
            print(
                f"Folder not found for {canonical_key} (Path: {folder_path})")
            self.app.start_pause_button.config(state="disabled")
            return

        if self.app.mode == 'restore':
            try:
                total, used, free = shutil.disk_usage(str(folder_path))
                self.app.destination_total_bytes = total
                self.app.destination_used_bytes = used
            except FileNotFoundError:
                app_logger.log(f"Path not found for disk usage: {folder_path}")
                return

        icon_name = self.app.buttons_map[button_text]['icon']

        # Determine the correct description based on mode and selection
        extra_info = ""
        if button_text == "Computer":
            if self.app.mode == 'backup':
                extra_info = Msg.STR["system_backup_info"]
            else:  # restore
                extra_info = Msg.STR["system_restore_info"]
        else:  # User folder
            if self.app.mode == 'backup':
                extra_info = Msg.STR["user_backup_info"]
            else:  # restore
                extra_info = Msg.STR["user_restore_info"]

        # CORRECTED LOGIC ORDER:
        # 1. Update backup type checkboxes BEFORE starting the calculation.
        if self.app.mode == 'backup':
            self._update_backup_type_controls()
        else:  # restore mode
            self.app.config_manager.set_setting(
                "restore_destination_path", folder_path)

        # 2. Unified logic for starting a calculation on the left canvas.
        self._start_left_canvas_calculation(
            button_text, str(folder_path), icon_name, extra_info)

    def _start_left_canvas_calculation(self, button_text, folder_path, icon_name, extra_info):
        self.app.start_pause_button.config(state="disabled")
        if self.app.mode == 'backup' and not self.app.destination_path:
            self.app.left_canvas_data.update({
                'icon': icon_name,
                'folder': button_text,
                'path_display': folder_path,
                'size': Msg.STR["select_destination_first"],
                'calculating': False,
                'extra_info': extra_info
            })
            self.app.drawing.redraw_left_canvas()
            return

        if self.app.mode == 'restore' and not self.app.right_canvas_data.get('path_display'):
            self.app.left_canvas_data.update({
                'icon': icon_name,
                'folder': button_text,
                'path_display': folder_path,
                'size': Msg.STR["select_source_first"],
                'calculating': False,
                'extra_info': extra_info
            })
            self.app.drawing.redraw_left_canvas()
            return

        if self.app.calculation_thread and self.app.calculation_thread.is_alive():
            self.app.calculation_stop_event.set()

        data_dict = self.app.left_canvas_data
        data_dict.update({
            'icon': icon_name,
            'folder': button_text,
            'path_display': folder_path,
            'size': Msg.STR["calculating_size"],
            'calculating': True,
            'extra_info': extra_info
        })

        self.app.drawing.start_backup_calculation_display()

        self.app.calculation_stop_event = threading.Event()

        # For system backup, now we default to the simple, fast (but for incremental inaccurate) full size calculation.
        # The accurate calculation is now triggered explicitly by the new checkbox.
        if button_text == "Computer":
            app_logger.log(
                "Using default (full) size calculation for system backup display.")
            exclude_patterns = self.app.data_processing.load_exclude_patterns()
            target_method = self.app.data_processing.get_folder_size_threaded
            args = (folder_path, button_text, self.app.calculation_stop_event,
                    exclude_patterns, self.app.mode)
        else:
            # For user folders, do not use any exclusions
            target_method = self.app.data_processing.get_user_folder_size_threaded
            args = (folder_path, button_text,
                    self.app.calculation_stop_event, self.app.mode)

        self.app.calculation_thread = threading.Thread(
            target=target_method, args=args)
        self.app.calculation_thread.daemon = True
        self.app.calculation_thread.start()

        if self.app.mode == 'backup':
            self._update_backup_type_controls()
        else:  # restore mode
            self.app.config_manager.set_setting(
                "restore_destination_path", folder_path)

    def on_right_canvas_click(self, event):
        if self.app.backup_is_running:
            app_logger.log("Action blocked: Backup is in progress.")
            return

        self.app.drawing.reset_projection_canvases()
        self.app.after(100, self._open_source_or_destination_dialog)

    def _open_source_or_destination_dialog(self):
        title = Msg.STR["select_dest_folder_title"] if self.app.mode == 'backup' else Msg.STR["select_restore_source_title"]
        path = self._get_path_from_dialog(title)
        if path:
            self._update_right_canvas_info(path)

    def _get_path_from_dialog(self, title) -> Optional[str]:
        self.app.update_idletasks()
        dialog = CustomFileDialog(self.app, mode="dir", title=title)
        self.app.wait_window(dialog)
        path = dialog.get_result()
        dialog.destroy()
        return path

    def _update_right_canvas_info(self, path):
        try:
            if self.app.mode == "backup":
                backup_root_to_exclude = f"/{path.strip('/').split('/')[0]}"
                try:
                    with open(AppConfig.USER_EXCLUDE_LIST_PATH, 'r+') as f:
                        lines = f.readlines()
                        f.seek(0)
                        if not any(backup_root_to_exclude in line for line in lines):
                            lines.append(f"\n{backup_root_to_exclude}\n")
                        f.writelines(lines)
                except FileNotFoundError:
                    with open(AppConfig.USER_EXCLUDE_LIST_PATH, 'w') as f:
                        f.write(f"{backup_root_to_exclude}\n")
                except IOError as e:
                    app_logger.log(f"Error updating exclusion list: {e}")

                total, used, free = shutil.disk_usage(path)
                self.app.destination_path = path
                self.app.destination_total_bytes = total
                self.app.destination_used_bytes = used
                size_str = f"{used / (1024**3):.2f} GB / {total / (1024**3):.2f} GB"

                self.app.right_canvas_data.update({
                    'folder': os.path.basename(path.rstrip('/')),
                    'path_display': path,
                    'size': size_str
                })
                self.app.config_manager.set_setting(
                    "backup_destination_path", path)
                self.app.drawing.redraw_right_canvas()
                self.app.drawing.update_target_projection()

                current_source = self.app.left_canvas_data.get('folder')
                if current_source:
                    self.on_sidebar_button_click(current_source)
                self._update_backup_type_controls()

            elif self.app.mode == "restore":
                self.app.right_canvas_data.update({
                    'folder': os.path.basename(path.rstrip('/')),
                    'path_display': path,
                    'size': ''
                })
                self.app.config_manager.set_setting(
                    "restore_source_path", path)
                self.app.drawing.calculate_restore_folder_size()
                self.app.start_pause_button.config(state="normal")

        except FileNotFoundError:
            with message_box_animation(self.app.calculating_animation):
                MessageDialog(master=self.app, message_type="error",
                              title=Msg.STR["error"], text=Msg.STR["path_not_found"].format(path=path)).show()

    def reset_to_default_settings(self):
        try:
            AppConfig.create_default_user_excludes()
        except OSError as e:
            app_logger.log(f"Error creating default user exclude list: {e}")

        self.app.config_manager.set_setting("backup_destination_path", None)
        self.app.config_manager.set_setting("restore_source_path", None)
        self.app.config_manager.set_setting("restore_destination_path", None)

        # Remove advanced settings
        self.app.config_manager.remove_setting("backup_animation_type")
        self.app.config_manager.remove_setting("calculation_animation_type")
        self.app.config_manager.remove_setting("force_full_backup")
        self.app.config_manager.remove_setting("force_incremental_backup")
        self.app.config_manager.remove_setting("force_compression")
        self.app.config_manager.remove_setting("force_encryption")

        # Update the main UI to reflect the cleared settings
        self.app.update_backup_options_from_config()

        AppConfig.generate_and_write_final_exclude_list()
        app_logger.log("Settings have been reset to default values.")

        settings_frame = self.app.settings_frame
        if settings_frame:
            settings_frame.load_and_display_excludes()
            settings_frame._load_hidden_files()
        self.app.destination_path = None
        self.app.start_pause_button.config(state="disabled")

        # Clear the canvases and reset the UI to its initial state for the current mode
        self.app.backup_left_canvas_data.clear()
        self.app.backup_right_canvas_data.clear()
        self.app.restore_left_canvas_data.clear()
        self.app.restore_right_canvas_data.clear()

        with message_box_animation(self.app.animated_icon):
            MessageDialog(master=self.app, message_type="info",
                          title=Msg.STR["settings_reset_title"], text=Msg.STR["settings_reset_text"])

    def _parse_size_string_to_bytes(self, size_str: str) -> int:
        """Parses a size string like '38.61 GB' into bytes."""
        if not size_str or size_str == Msg.STR["calculating_size"]:
            return 0

        parts = size_str.split()
        if len(parts) != 2:
            return 0  # Invalid format

        try:
            value = float(parts[0])
            unit = parts[1].upper()

            if unit == 'B':
                return int(value)
            elif unit == 'KB':
                return int(value * (1024**1))
            elif unit == 'MB':
                return int(value * (1024**2))
            elif unit == 'GB':
                return int(value * (1024**3))
            elif unit == 'TB':
                return int(value * (1024**4))
            else:
                return 0
        except ValueError:
            return 0

    def _set_ui_state(self, enable: bool, keep_cancel_enabled: bool = False):
        # Sidebar Buttons
        for text, data in self.app.buttons_map.items():
            # Find the actual button widget in the sidebar_buttons_frame
            # This assumes the order of creation is consistent or we can identify by text
            # A more robust way would be to store references to the buttons in a dict in MainApplication
            # For now, let's iterate through children and match text
            for child in self.app.sidebar_buttons_frame.winfo_children():
                if isinstance(child, tk.ttk.Button) and child.cget("text") == text:
                    child.config(state="normal" if enable else "disabled")
                    break

        # Schedule and Settings buttons in sidebar
        self.app.schedule_dialog_button.config(
            state="normal" if enable else "disabled")
        self.app.settings_button.config(
            state="normal" if enable else "disabled")

        # Mode Button (arrow between canvases)
        self.app.mode_button.config(state="normal" if enable else "disabled")

        # Top Navigation Buttons
        for i, button in enumerate(self.app.nav_buttons):
            button.config(state="normal" if enable else "disabled")

        # Right Canvas (Destination/Restore Source)
        if enable:
            self.app.right_canvas.bind(
                "<Button-1>", self.app.actions.on_right_canvas_click)
            self.app.right_canvas.config(cursor="hand2")
        else:
            self.app.right_canvas.unbind("<Button-1>")
            self.app.right_canvas.config(cursor="")

        # Checkboxes in the task bar
        if enable:
            # When enabling, re-run the logic that sets the correct state
            # for all checkboxes based on config and context.
            self.app.update_backup_options_from_config()
            self.app.actions._update_backup_type_controls()
        else:
            # When disabling, just disable all of them.
            checkboxes = [
                self.app.full_backup_cb,
                self.app.incremental_cb,
                self.app.accurate_size_cb,
                self.app.compressed_cb,
                self.app.encrypted_cb,
                self.app.test_run_cb,
                self.app.bypass_security_cb
            ]
            for cb in checkboxes:
                cb.config(state="disabled")

        # Special handling for the cancel button during accurate calculation
        if keep_cancel_enabled:
            self.app.start_pause_button.config(state="normal")

    def toggle_start_cancel(self):
        # If an accurate calculation is running, cancel it.
        if self.app.accurate_calculation_running:
            app_logger.log("Accurate size calculation cancelled by user.")
            self.app.accurate_calculation_running = False
            self.app.genaue_berechnung_var.set(False)

            # Stop all animations and restore UI
            self.app.animated_icon.stop("DISABLE")
            if self.app.left_canvas_animation:
                self.app.left_canvas_animation.stop()
            self.app.left_canvas_data['calculating'] = False
            self.app.drawing.redraw_left_canvas()

            # Restore bottom action bar
            self.app.task_progress.stop()
            self.app.task_progress.config(mode="determinate", value=0)
            self.app.info_label.config(
                # Orange for cancelled
                text=Msg.STR["accurate_calc_cancelled"], foreground="#E8740C")
            self.app.start_pause_button.config(text=Msg.STR["start"])
            self._set_ui_state(True)
            return

        # If a backup is already running, we must be cancelling.
        if self.app.backup_is_running:
            self.app.animated_icon.stop("DISABLE")

            delete_path = getattr(self.app, 'current_backup_path', None)
            is_system_backup = self.app.backup_manager.is_system_process

            if is_system_backup:
                if delete_path:
                    self.app.backup_manager.cancel_and_delete_privileged_backup(
                        delete_path)
                    app_logger.log(
                        Msg.STR["backup_cancelled_and_deleted_msg"])
                    self.app.info_label.config(
                        text=Msg.STR["backup_cancelled_and_deleted_msg"])
                else:
                    self.app.backup_manager.cancel_backup()
                    app_logger.log(
                        "Backup cancelled, but directory could not be deleted (path unknown).")
                    self.app.info_label.config(
                        text="Backup cancelled, but directory could not be deleted (path unknown).")
            else:
                self.app.backup_manager.cancel_backup()
                if delete_path:
                    try:
                        app_logger.log(
                            f"Attempting to delete non-privileged path: {delete_path}")
                        if os.path.isdir(delete_path):
                            shutil.rmtree(delete_path)
                        app_logger.log(
                            Msg.STR["backup_cancelled_and_deleted_msg"])
                        self.app.info_label.config(
                            text=Msg.STR["backup_cancelled_and_deleted_msg"])
                    except Exception as e:
                        app_logger.log(f"Error deleting backup directory: {e}")
                        self.app.info_label.config(
                            text=f"Error deleting backup directory: {e}")
                else:
                    app_logger.log(
                        "Backup cancelled, but no path found to delete.")
                    self.app.info_label.config(
                        text="Backup cancelled, but no path found to delete.")

            if hasattr(self.app, 'current_backup_path'):
                self.app.current_backup_path = None

            # Reset state
            self.app.backup_is_running = False
            self.app.start_pause_button["text"] = Msg.STR["start"]
            self._set_ui_state(True)

        # Otherwise, we are starting a new backup.
        else:
            if self.app.start_pause_button['state'] == 'disabled':
                return

            self.app.backup_is_running = True

            # --- Record and Display Start Time ---
            self.app.start_time = datetime.datetime.now()
            start_str = self.app.start_time.strftime("%H:%M:%S")
            self.app.start_time_label.config(text=f"Start: {start_str}")
            self.app.end_time_label.config(text="Ende: --:--:--")
            self.app.duration_label.config(text="Dauer: --:--:--")
            self.app.info_label.config(text="Backup wird vorbereitet...")
            # --- End Time Logic ---

            self.app.start_pause_button["text"] = Msg.STR["cancel_backup"]
            self.app.update_idletasks()

            self.app.log_window.clear_log()
            self._set_ui_state(False)

            self.app.animated_icon.start()

            self.app._process_backup_queue()

            if self.app.mode == "backup":
                if self.app.vollbackup_var.get():
                    self._start_system_backup("full")
                else:
                    self._start_system_backup("incremental")
            else:
                pass

    def _start_system_backup(self, mode):
        base_dest = self.app.destination_path
        if not base_dest:
            MessageDialog(master=self.app, message_type="error",
                          title=Msg.STR["error"], text=Msg.STR["err_no_dest_folder"])
            return

        if base_dest.startswith("/home"):
            with message_box_animation(self.app.animated_icon):
                MessageDialog(master=self.app, message_type="error",
                              title=Msg.STR["error"], text=Msg.STR["system_backup_in_home_error"])
            return

        try:
            locale.setlocale(locale.LC_TIME, 'de_DE.UTF-8')
        except locale.Error:
            app_logger.log(
                "Could not set locale to de_DE.UTF-8. Using default.")

        now = datetime.datetime.now()
        date_str = now.strftime("%d-%B-%Y")
        time_str = now.strftime("%H%M%S")
        folder_name = f"{date_str}_{time_str}_system_{mode}"
        final_dest = os.path.join(base_dest, "pybackup", folder_name)
        # Store the path for potential deletion
        self.app.current_backup_path = final_dest

        source_size_bytes = self.app.left_canvas_data.get('total_bytes', 0)

        exclude_file_paths = []
        if AppConfig.GENERATED_EXCLUDE_LIST_PATH.exists():
            exclude_file_paths.append(AppConfig.GENERATED_EXCLUDE_LIST_PATH)
        if AppConfig.USER_EXCLUDE_LIST_PATH.exists():
            exclude_file_paths.append(AppConfig.USER_EXCLUDE_LIST_PATH)

        is_dry_run = self.app.testlauf_var.get()
        is_compressed = self.app.compressed_var.get()

        self.app.backup_manager.start_backup(
            queue=self.app.queue,
            source_path="/",
            dest_path=final_dest,
            is_system=True,
            is_dry_run=is_dry_run,
            exclude_files=exclude_file_paths,
            source_size=source_size_bytes,
            is_compressed=is_compressed)

    def _start_user_backup(self, sources):
        dest = self.app.destination_path
        if not dest:
            MessageDialog(master=self.app, message_type="error",
                          title=Msg.STR["error"], text=Msg.STR["err_no_dest_folder"])
            return

        is_dry_run = self.app.testlauf_var.get()
        for source in sources:
            self.app.backup_manager.start_backup(
                queue=self.app.queue,
                source_path=source,
                dest_path=dest,
                is_system=False,
                is_dry_run=is_dry_run)