OMG don't store your coins on an exchange long-term. During a real crash, the exchanges have a tendency to be down just when you want to get your coins out. The less reputable exchanges (i.e., everyone but Coinbase) have a history of absconding with the coins during a crisis (see: "exit scams"). I would put your wallet on a hardware wallet, or at least an encrypted removable drive (this might not apply if you're in a dangerous area where break-ins are common).