The reason I am asking is...It is recommended that you keep one months supply of cash on hand in case a Cyprus happens here. It might make more sense on having a months worth of cash on a card vs. actual cash on hand.
SO... SOOO much fail in one little sentence!!! Consider:
Long lasting power outage/EMP
ATM/bank runs draining physical currency
large scale communications blackout
"cash" on a card is not CASH, it is 1's and 0's that says you have such and such amount of currency. Physical cash in your hand could still be used to make purchases at times when the little piece of plastic becomes useless.
DO NOT FALL INTO THE CASHLESS SOCIETY TRAP!