Add retention policy for restic.

Makefile

@@ -80,6 +80,7 @@ restic-env \
 restic-password \
 restic-restore.sh \
 restic-snapshot.sh \
+restic-scheduled-snapshot.sh \
 app/.env \
 $(config_dir)ssh-keys \
 app.tar.gz
@@ -127,6 +128,7 @@ archive:
 	echo ")" >> all-apps/root-napp.scm
 	tar -cf nassella-latest.tar all-apps cl.yaml init-restic.sh main.tf make-caddyfile-env.sh make-top-level-docker-compose.sh Makefile \
 		make-generated.sh make-restic-generated.sh make-restic-password.sh restic-snapshots.sh copy-apps.sh restic-restore.sh restic-snapshot.sh \
+		restic-scheduled-snapshot.sh \
 		.terraform.lock.hcl
 	cp nassella-latest.tar src/
 

cl.yaml

@@ -65,7 +65,7 @@ systemd:
         [Service]
         Type=oneshot
         EnvironmentFile=/restic-env
-        ExecStart=/usr/bin/bash -c "docker run --rm --volume /nassella:/nassella --volume /restic-password:/restic-password -e AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID} -e AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY} -i restic/restic:0.18.0 backup --verbose --repo s3:${BACKBLAZE_BUCKET_URL} --password-file /restic-password --tag daily_automatic /nassella"
+        ExecStart=/restic-scheduled-snapshot.sh
         ExecStopPost=systemctl start app.service
 
     - name: restic-backup.timer
@@ -152,6 +152,10 @@ storage:
       mode: 0755
       contents:
         local: restic-snapshot.sh
+    - path: /restic-scheduled-snapshot.sh
+      mode: 0755
+      contents:
+        local: restic-scheduled-snapshot.sh
     - path: /etc/ssh/sshd_config.d/custom.conf
       overwrite: true
       mode: 0600

restic-scheduled-snapshot.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# Copyright 2025-2026 Thomas Hintz
+
+# This file is part of Nassella.
+
+# Nassella is free software: you can redistribute it and/or modify it under the
+# terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+
+# Nassella is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with Nassella. If not, see <https://www.gnu.org/licenses/>.
+
+docker run --rm --volume /nassella:/nassella --volume /restic-password:/restic-password -e AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID} -e AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY} -i restic/restic:0.18.0 backup --verbose --repo s3:${BACKBLAZE_BUCKET_URL} --password-file /restic-password --tag daily_automatic /nassella
+
+# only keep one snapshot per day for the last week and one snapshot per month for the last 3 months
+docker run --rm --volume /nassella:/nassella --volume /restic-password:/restic-password -e AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID} -e AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY} -i restic/restic:0.18.0 forget --tag daily_automatic --keep-daily 7 --keep-monthly 3 --verbose --repo s3:${BACKBLAZE_BUCKET_URL} --password-file /restic-password /nassella