feat: add backup role using restic

roles/backup/tasks/main.yml

@@ -0,0 +1,31 @@
+---
+- name: Install Restic
+  ansible.builtin.apt:
+    name: restic
+    state: present
+  become: true
+
+- name: Deploy restic backup script
+  ansible.builtin.template:
+    src: restic-backup.sh.j2
+    dest: /usr/local/bin/restic-backup.sh
+    mode: "0700" # Only root can read/execute this because it contains secrets
+
+- name: Deploy restic systemd service
+  ansible.builtin.template:
+    src: restic-backup.service.j2
+    dest: /etc/systemd/system/restic-backup.service
+    mode: "0644"
+
+- name: Deploy restic systemd timer
+  ansible.builtin.template:
+    src: restic-backup.timer.j2
+    dest: /etc/systemd/system/restic-backup.timer
+    mode: "0644"
+
+- name: Enable and start backup timer
+  ansible.builtin.systemd:
+    name: restic-backup.timer
+    enabled: yes
+    state: started
+    daemon_reload: yes

roles/backup/templates/restic-backup.service.j2

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+[Unit]
+Description=Run Restic Backup
+After=network-online.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/bin/restic-backup.sh

roles/backup/templates/restic-backup.sh.j2

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+#!/bin/bash
+## Ansible managed
+
+## Secrets are passed via Ansible Vault variables
+export RESTIC_REPOSITORY="{{ vault_restic_repo_url }}"
+export RESTIC_PASSWORD="{{ vault_restic_password }}"
+export AWS_ACCESS_KEY_ID="{{ vault_aws_access_key }}"
+export AWS_SECRET_ACCESS_KEY="{{ vault_aws_secret_key }}"
+
+set -e
+
+echo "Starting Restic Backup at $(date)"
+
+## Run the backup (docker volumes & config files)
+restic backup \
+  /etc \
+  /opt/docker-data \
+  --exclude /opt/docker-data/tmp \
+  --cleanup-cache
+
+restic forget --prune --keep-daily 7 --keep-weekly 4 --keep-monthly 6
+
+echo "Restic backup completed at $(date)"

roles/backup/templates/restic-backup.timer.j2

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+[Unit]
+Description=Run Restic Backup Daily at 4:00 AM
+
+[Timer]
+OnCalendar=*-*-* 04:00:00
+Persistent=true
+RandomizedDelaySec=1800
+
+[Install]
+WantedBy=timers.target