The recent DBS and Citibank outage in October left many people unable to pay for their transactions and draw money from the ATMs. What goes on when critical banking infrastructure goes black? How are data centres part of this and should we really revert to carrying cash again? Steven Chia gets answers from Dr Patrick Thng, director of the Master's programme for financial technology and analytics at the Singapore Management University and Ashish Kakar, research director for IDC Financial Insights, Asia Pacific. See omnystudio.com/listener for privacy information.