Google has a new service you can apply for, Project Shield. It utilizes their infrastructure to protect against DDOS attacks.
“Project Shield uses technology called a reverse proxy, which allows a webmaster to serve their site through Google infrastructure for free, providing a “shield” against would-be attackers. So far we’ve protected hundreds of news organizations and human rights websites that have faced attacks aimed at censoring free expression. By protecting these sites, we’ve helped to keep vital information online during elections, major crises and conflicts.”