Thanks for the share, Caspar. Unfortunately, Hostgator will not upgrade the PHP to the required version for use of BackWPup 3+, therefore all hosted accounts on HostGator servers will need to manually modify the htaccess file with the outline provided via hyperlink below.
Response from HostGator technical support:
We understand your need for the need of later versions of php, however we keep php 5.2.17 installed as the primary for compatibility with our customers who still require it. This is why we have also installed php 5.3 on all shared and reseller servers, you can use this by using suPHP within your .htaccess file. All of the information needed to use php 5.3 with your accounts can be found in our support portal here: https://support.hostgator.com/articles/hosting-guide/hardware-software/php-5-3
I apologize for any confusion with compatibility, however this should help you get your backups working. If you have any other questions or concerns please let us know.
Linux Systems Administrator
Since Hostgator uses the default cPanel hosting management, probably most the other hosts using cpanel too may not have their PHP active to the required level to run BackWPup 3+. The version of PHP installed is visible bottom left when logging into your cpanel account.