I'm saving 60% of my after-tax income. I don't think there are any hard and fast rules here, but I'd suggest people save at least 40%. 100% of my savings are in BTC. In fiat I only have what I need to pay my bills, which sits in my instant access savings account for less than a month.

If I have an emergency expense, like something breaking in my house that needs fixing, I can always send some corn. The chances I both have an emergency and realize a substantial fiat loss that way are slim.