Some great language there: framing it as an attack by criminals (gains sympathy from users), explains in plain-terms what a DDOS is (front door analogy), emphasizes (twice!) that user data is safe, apologizes for the likely downtime, informs people where to get updates.
Probably worth bookmarking this for when you [hopefully never] have to deal with this same situation.
Probably worth bookmarking this for when you [hopefully never] have to deal with this same situation.