Ask HN: Deleting emails when your boss is under Congressional investigation?

Backblaze is spectacular when it comes to sharing data about performance and cost associated with their backup service. But after consulting their site and others I can't find performance data concerning how fast I can delete backups when a former US Secretary of State is under Congressional or FBI investigation. Any resources for that? I've already eliminated Tarsnap, Datto and Apple's Time Machine.

http://www.businessinsider.com/hillary-clinton-email-2015-10