Hello again, Tom.
I've been using the HMBKP_ATTACHMENT_MAX_FILESIZE constant in wp-config for a while now, but thought it was time to revive this thread to help make two important improvements a reality:
1. Finally bring the maximum attachment size to the interface, as proposed by HAL-9000. By the way, other variables like HMBKP_PATH, HMBKP_EXCLUDE (particularly this one!) and HMBKP_SCHEDULE_TIME could be there, too.
2. Increase the default maximum attachment size from 10 to at least 20MB. Gmail set that limit to 25MB back in 2009. Yahoo, AOL and Hotmail/Outlook accept 25MB, too, and most shared hosts have a 50MB limit.
Thanks for the plugin and congratulations for the way you started monetizing it with premium addons.