Revert "[#54213626] Allow nagios to read backups dir"
Revert "[#54213626] Allow nagios to read backups dir"

This reverts commit a537ec8e0eebb0f27078283c1762b8415bd4fb14.

I give up. Checking `BACKUPINFO` is probably the wrong approach. Not least
because we now won't write the file if a new backup fails first time, so it
will never be checked.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet