Perch Backup in Perch 3

Hi

I've tried to load the Perch backup app in Perch 3 but get the following error on the front-end of the site appears...

Warning: include(/home/indx/7ZO3HW67/htdocs/cms/addons/apps/perch_backup/runtime.php): failed to open stream: No such file or directory in /home/indx/7ZO3HW67/htdocs/cms/core/inc/apps.php on line 19

Warning: include(/home/indx/7ZO3HW67/htdocs/cms/addons/apps/perch_backup/runtime.php): failed to open stream: No such file or directory in /home/indx/7ZO3HW67/htdocs/cms/core/inc/apps.php on line 19

Warning: include(): Failed opening '/home/indx/7ZO3HW67/htdocs/cms/addons/apps/perch_backup/runtime.php' for inclusion (include_path='.:/usr/local/php70/lib/php') in /home/indx/7ZO3HW67/htdocs/cms/core/inc/apps.php on line 19

..the client wants to be able to manually take a backup of the site, is there any way of doing this in Perch 3?

Many thanks

Perch: 3.0.8, PHP: 7.0.15, MySQL: mysqlnd 5.0.12-dev - 20150407 - $Id: b5c5906d452ec590732a93b051f3827e02749b83 $, with PDO
Server OS: Linux, cgi-fcgi
Installed apps: content (3.0.8), assets (3.0.8), categories (3.0.8), perch_blog (5.6.1), perch_forms (1.9), perch_members (1.6.1), perch_backup (1.2)
App runtimes: <?php $apps_list = [ 'perch_blog', 'perch_forms', 'perch_members', 'perch_backup' ];
PERCH_LOGINPATH: /cms
PERCH_PATH: /home/indx/7ZO3HW67/htdocs/cms
PERCH_CORE: /home/indx/7ZO3HW67/htdocs/cms/core
PERCH_RESFILEPATH: /home/indx/7ZO3HW67/htdocs/cms/resources
Image manipulation: GD Imagick
PHP limits: Max upload 128M, Max POST 128M, Memory: 256M, Total max file upload: 128M
F1: 0c66c2e1f82f9e0b7617b2cb8270f2c7
Resource folder writeable: Yes
HTTP_HOST: indexwm.co.uk
DOCUMENT_ROOT: /home/indx/7ZO3HW67/htdocs/
REQUEST_URI: /cms/core/settings/diagnostics/
SCRIPT_NAME: /cms/core/settings/diagnostics/index.php