cadfile on "[Plugin: BackWPup Free - WordPress Backup Plugin] What is the purpose of a HEAD check before running a job"

I had the BackWpup "Missing or not expected HTTP response headers" conflict with Bulletproof security plugin and my backup jobs were always blank.

Spambots do many HEAD checks and is why Bulletproof had HEAD checks blocked. Now to get BackWpup to work with my install I have to open my site to spambot attempts.

Why is BackWpup doing a HEAD check before running a backup job?

http://forum.ait-pro.com/forums/topic/backwpup-missing-or-not-expected-http-response-headers/

https://wordpress.org/plugins/backwpup/