some comparision WebsiteBacker vs Drupal?
Impossible to compare, completely different types of software. Drupal is a very complex platform for high end enterprise sites, created by technicaly skilled developers and coders. WB is user friendly, low entry yet fairly powerful cms for small to midsized general purpose websites.
Comparison of WP and WB is also difficult. WP is very much blog oriented, although you can create more allround sites using all kinds of plugins. WB is a an allround cms suitable for small to midsized sites, but lacks in blogging and community functions.
Personally I think WB is the most user friendly cms in its sort, far easier to use (for both designers and admin) than WP and Joomla.
One of the strengths of WB is it easyness to create templates for it. That's why there not much really good looking professional templates for it. You can easily create a template yourself based on a general HTMl template, or own design.