Add an untested barebones backup script wrapper

roles/backups/defaults/main.yml

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+# vim:ft=ansible:
+backups_dir: "/opt/backups"
+backups_outdir: "/backups"
+backups_modulesdir: "/opt/backups/modules"
+backups_script: "/opt/backups/backup.sh"

roles/backups/tasks/main.yml

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+#!/usr/bin/ansible-playbook
+# vim:ft=ansible:
+---
+- name: Set up general backups
+  block:
+    - name: Create backups directories
+      file:
+        state: directory
+        mode: "0700"
+        path: "{{ item }}"
+      loop:
+        - "{{ backups_dir }}"
+        - "{{ backups_outdir }}"
+        - "{{ backups_modulesdir }}"
+    - name: Template out backup script
+      template:
+        src: "backup.sh"
+        dest: "{{ backups_script }}"
+        mode: "0700"
+    - name: Set backup cronjob
+      cron:
+        minute: "0"
+        hour: "2"
+        name: ansible-backup
+        job: "{{ backups_script }}"
+  become: yes

roles/backups/templates/backup.sh

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+#! /bin/bash
+#
+# backup.sh
+# General-purpose backup script that accepts subtasks
+# Copyright (C) 2020 Vintage Salt <rehashedsalt@cock.li>
+#
+# Distributed under terms of the MIT license.
+#
+
+set -e
+
+export BACKUPSDIR="{{ backups_outdir }}"
+export MODULESDIR="{{ backups_modulesdir }}"
+export DATE="$(date -Iseconds)"
+
+# Helper functions
+log() {
+	[ -z "$1" ] && return 1
+	printf "$(date -Iseconds): $1\n"
+}
+
+# Do the do
+if ! [ -d "$BACKUPSDIR" ]; then
+	log "Unable to find backups directory: $BACKUPSDIR"
+	exit 1
+fi
+if ! [ -d "$MODULESDIR" ]; then
+	log "Unable to find modules directory: $MODULESDIR"
+	exit 2
+fi
+log "Beginning backups"
+for file in "$MODULESDIR"/*; do
+	# Just keep going if we don't have any tasks to do
+	[ -f "$file" ] || continue
+	# Execute the module and alert if it fails
+	log "Executing module: $file"
+	(
+		source "$file"
+	) || {
+		log "Error executing module: $file"
+	}
+done
+