diff --git a/.gitea/workflows/dag-config-check.yml b/.gitea/workflows/dag-config-check.yml
new file mode 100644
index 0000000..48980ae
--- /dev/null
+++ b/.gitea/workflows/dag-config-check.yml
@@ -0,0 +1,67 @@
+# .github/workflows/validate-dags.yml
+name: Validate DAGs
+
+on:
+  workflow_dispatch:
+  push:
+    paths: ['./app-configs/rinoa/dagu/dags/**']
+    branches-ignore:
+      - main
+
+env:
+  DAGS_PATH: "./app-configs/rinoa/dagu/dags"
+  VAULT_ADDR: ${{ secrets.VAULT_ADDR }}
+  VAULT_TOKEN: ${{ secrets.VAULT_TOKEN }}
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Ansible
+        uses: alex-oleshkevich/setup-ansible@v1.0.1
+        with:
+          version: "11.4.0"
+
+      - name: Set up Vault CLI
+        uses: hashicorp/setup-vault@v2
+        with:
+          version: 1.18.0
+
+      - name: Install hvac (Vault Python SDK)
+        run: pip install hvac
+
+      - name: Render .yaml.j2 templates
+        uses: dawidd6/action-ansible-playbook@v2
+        with:
+          directory: .
+          vault_password: ${{ secrets.ANSIBLE_VAULT_PASSWORD }}
+          requirements: collections/requirements.yml
+          playbook: |
+            - hosts: localhost
+              gather_facts: false
+              vars:
+                vault_addr: ${{ env.VAULT_ADDR }}
+                vault_token: ${{ env.VAULT_TOKEN }}
+                dags_path: ${{ env.DAGS_PATH }}
+              tasks:
+                - name: Render DAG templates
+                  template:
+                    src: "{{ item }}"
+                    dest: "{{ item | regex_replace('\\.j2$', '') }}"
+                  loop: "{{ lookup('fileglob', dags_path ~ '/*.yaml.j2', wantlist=True) }}"
+
+      - name: Install dagu
+        uses: jaxxstorm/action-install-gh-release@v1
+        with:
+          repo: dagu-org/dagu
+          platform: linux
+          arch: amd64
+
+      - name: Validate DAGs
+        run: |
+          for dag in $(find ${DAGS_PATH} -type f -name "*.yaml" -a ! -name "*example*"); do
+            echo "Validating $dag"
+            dagu dry "$dag"
+          done
diff --git a/.gitea/workflows/gitea_tar-valon_ansible_deploy.yml b/.gitea/workflows/gitea_tar-valon_ansible_deploy.yml
index 95483bc..05e3b58 100644
--- a/.gitea/workflows/gitea_tar-valon_ansible_deploy.yml
+++ b/.gitea/workflows/gitea_tar-valon_ansible_deploy.yml
@@ -3,7 +3,7 @@ name: Gitea Branch PR & Ansible Deployment
 on:
   workflow_dispatch:
   workflow_run:
-    workflows: ["Home Assistant Config Check"]
+    workflows: [Home Assistant Config Check, Validate DAs]
     types:
       - completed
     branches: main
diff --git a/app-configs/rinoa/dagu/dags/mariadb-backups.yaml.j2 b/app-configs/rinoa/dagu/dags/mariadb-backups.yaml.j2
new file mode 100644
index 0000000..87c5666
--- /dev/null
+++ b/app-configs/rinoa/dagu/dags/mariadb-backups.yaml.j2
@@ -0,0 +1,33 @@
+name: mariadb-backup
+description: "Backup of all databases from MariaDB container"
+schedule: "30 23 * * *"
+
+env:
+  MARIADB_ROOT_PASSWORD: {{ lookup('community.hashi_vault.vault_kv2_get', 'env', engine_mount_point='rinoa-docker', url=vault_addr, token=vault_token)['secret']['MARIADB_ENVIRONMENT_MYSQL_ROOT_PASSWORD'] }}
+
+steps:
+  - name: list-all-databases
+    shell: nix-shell
+    shellPackages: [mariadb]
+    command: |
+      mariadb -h mariadb -u root -p"${MARIADB_ROOT_PASSWORD}" -Nse "SHOW DATABASES;" | egrep -v '(information|performance)_schema|mysql|sys'
+    output: RINOA_MADB_LIST
+
+  - name: db-folder-check-creation-backup
+    depends: list-all-databases
+    shell: nix-shell
+    shellPackages: [mariadb]
+    workingDir: /backups/dbs/mariadb
+    script: |
+      for mdatabase in $(echo ${RINOA_MADB_LIST}) ; do
+        mkdir -p ${mdatabase}
+        mariadb_dump --user=root --password"${MARIADB_ROOT_PASSWORD}" --databases ${madb} > ${mdatabase}/${mdatabase}_$(date +%Y-%m-%dT%H-%M-%S).sql
+      done
+
+  - name: db-backup-cleanup
+    depends:
+      - list-all-databases
+      - db-folder-check-creation-backup
+    workingDir: /backups/dbs/mariadb
+    command: >
+      find $(pwd) -type f -name "*.sql" -ctime +7 | xargs rm -fv
\ No newline at end of file