Set CPUQuota to 1/4 of available CPU

templates/restic-backup.service.j2

@@ -4,6 +4,9 @@ Description=Restic backup
 [Service]
 Type=oneshot
 User={{ restic_user }}
+
+CPUQuota={{ 25 * ansible_processor_vcpus }}%
+
 {% if restic_ssh_enabled %}
 Environment="RESTIC_REPOSITORY=sftp:{{ restic_ssh_host }}:{{ restic_repository_name }}"
 {% else %}