Integrate restic backup system

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

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+# This script sequentially executes all shell scripts matching
+# /etc/backups/*.backup.sh, with environment variables configured to publish
+# backups to the local Restic REST server.
+
+# Get passed along to subcalls to bash
+export RESTIC_REPOSITORY='rest:http://{{ groups['nas'][0] }}:8000/backups'
+export RESTIC_PASSWORD_FILE='/etc/backups/restic_backups_passwd'
+
+for script in $(find /etc/backups -name '*.backup.sh'); do
+    bash "$script"
+done
+
+# Prune older backups
+restic forget --keep-last 7 && \
+    restic prune