Zanetackett refuses to dismiss the haircut route, but says any haircut estimations (like 63%) are false. Poloniex got hacked for a relatively small amount, and still took forever to pay everyone back. How much does Bitfinex earn in fees, and how long would it take to pay everyone back out of them?
Well, a long time. Say roughly 0.1% fees on 200K per week equals about 10K BTC per year. 15% cut of lending fees would net around 1-2 million per year in USD also (about 3K BTC per year).
I scan my actual paper-and-toner wallets, copy them to multiple encrypted microSD cards, hide them well in multiple offsite stashes, and then securely shred the original files and tear up the original printed wallets and flush them down the toilet.
Flash memory has limited data retention, have you taken precautions against this?