I'm running 2.2.4 of the plug-in.
I have a very small WordPress site and am trying to get your backup software to work. It's the only site under public_html.
This is the error I get when trying run a full backup including both DB and files:
The backup file is 159.93 MiB in size and the amount of memory required to encode this into email format (around 399.83 MiB) will consume most, if not all, of PHP's available memory of 59 MiB.
Failed at: /home1/terryba1/public_html/mainsite/wp-content/plugins/wponlinebackup/include/email.php:75