Optimized udev rules for backup to usb with the help of chat gpt https://chat.openai.com/share/a75ca771-d8a4-4b75-9912-c515ba371ae4

roles/independent_backup-to-usb/README.md

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+# independent_backup-to-usb
+
+This Ansible role automates the process of performing backups to a swappable USB device.
+
+## Features
+
+- Automatically starts the backup process when a specific USB device is plugged in.
+- Provides a systemd service to run the backup script at boot if the USB device is already connected.
+- Supports customization of the backup source path and mount point.
+
+## Configuration
+
+The following variables can be customized in the `vars/main.yml` file:
+
+- `mount_point`: The mount point where the USB device will be mounted.
+- `backup_to_usb_script_path`: The path to the backup script that will be executed when the USB device is connected.
+
+## Credits
+
+This role was created and maintained by Kevin Veen-Birkenbach.
+Contact: kevin@veen.world
+
+## More Information
+
+For more details on how the `independent_backup-to-usb` role works, please refer to the Ansible documentation and the role's source code.

roles/independent_backup-to-usb/handlers/main.yml

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+---
+- name: Reload udev rules
+  command: udevadm control --reload-rules && udevadm trigger

roles/independent_backup-to-usb/meta/main.yml

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+---
+dependencies:
+  - role: independent_backups-cleanup-service

roles/independent_backup-to-usb/tasks/main.yml

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+---
+- name: Copy udev rule to the rules directory
+  template:
+    src: 99-usbstick.rules.j2
+    dest: /etc/udev/rules.d/
+  notify: Reload udev rules
+
+- name: Copy backup script to the scripts directory
+  template:
+    src: backup-to-usb.sh.j2
+    dest: "{{ backup_to_usb_script_path }}"
+    owner: root
+    group: root
+    mode: '0755'
+
+- name: Copy systemd service to systemd directory
+  template:
+    src: backup-to-usb.service.j2
+    dest: /etc/systemd/system/backup-to-usb.service
+    owner: root
+    group: root
+    mode: '0644'
+
+- name: Enable and start service
+  systemd:
+    name: backup-to-usb
+    enabled: yes
+    state: started

roles/independent_backup-to-usb/templates/99-usbstick.rules.j2

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+ACTION=="add", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="{{ backup_to_usb_serial_short }}", RUN+="/usr/bin/systemd-mount --no-block $devnode {{ mount_point }}", SYMLINK+="backup_usb"

roles/independent_backup-to-usb/templates/backup-to-usb.service.j2

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+[Unit]
+Description=Backup to USB when it's plugged in
+After=local-fs.target
+OnFailure=systemd-email@%n.service
+
+[Service]
+ExecStart={{ backup_to_usb_script_path }} {{ mount_point }}/{{ backup_to_usb_subdirectory }} {{ backup_to_usb_source_path }}
+
+[Install]
+WantedBy=multi-user.target

roles/independent_backup-to-usb/templates/backup-to-usb.sh.j2

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+#!/bin/sh
+backup_to_usb_destination_path="{{ mount_point }}" &&
+echo "backup to usb destination path: $backup_to_usb_destination_path" &&
+
+source_path="{{ backup_to_usb_source_path }}" &&
+echo "source path: $source_path" || exit 1
+
+if [ ! -d "$backup_to_usb_destination_path" ]; then
+    echo "Directory $backup_to_usb_destination_path does not exist" &&
+    exit 1
+fi
+
+machine_id="$(sha256sum /etc/machine-id | head -c 64 )" &&
+echo "machine id: $machine_id" &&
+
+versions_path="$backup_to_usb_destination_path$machine_id/backup-to-usb/" &&
+echo "versions path: $versions_path" || exit 1
+
+if [ ! -d "$versions_path" ]; then
+    echo "Creating $versions_path..." &&
+    mkdir -vp $versions_path || exit 1
+fi 
+
+previous_version_path="$(ls -d $versions_path* | tail -1)" &&
+echo "previous versions path: $previous_version_path" &&
+
+current_version_path="$versions_path$(date '+%Y%m%d%H%M%S')" &&
+echo "current versions path: $current_version_path" &&
+
+echo "creating backup destination folder..." &&
+mkdir -vp "$current_version_path" &&
+
+echo "Starting synchronization..."
+rsync -abP --delete --delete-excluded --link-dest="$previous_version_path" "$source_path" "$current_version_path" &&
+echo "Synchronization finished." || exit 1

roles/independent_backup-to-usb/vars/main.yml

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+---
+mount_point: "/mnt/usbstick_{{ backup_to_usb_serial_short }}"
+backup_to_usb_script_path: "/usr/local/sbin/backup-to-usb.sh"
+backups_folder_path: "{{mount_point}}{{backup_to_usb_subdirectory}}"