When pondering how much to spend on cybersecurity defenses, be sure to consider the cost of a retail data breach. Ill-advised security practices and a lack of  proper cybersecurity defenses can cost a company quite a bit.

A data breach of the scale of that which impacted Home Depot in 2014 will cost hundreds of millions of dollars to address. The home depot data breach was huge. It was the largest retail data breach involving a point of sale system that has been seen so far. Malware had been downloaded that allowed cyber criminals to obtain over 50 million credit card numbers from home depot customers and around 53 million email addresses.

The attack was completed using stolen credentials from one of the retailer’s vendors. Those credentials were used to obtain access to the network. Those privileges were subsequently elevated, the Home Depot network was explored, and when access to the POS system was obtained, malware was downloaded to record credit card details. The malware infection went unnoticed for five months between April and September 2014.

Last year, Home Depot agreed to pay out $19.5 million to customers that had been impacted by the breach. The payout included the costs of providing credit monitoring services to those affected by the breach. Home Depot has also paid out a minimum of $134.5 million to credit card companies and banks. The latest settlement amount will permit banks and credit card companies to submit claims for $2 per compromised credit card without having to show proof of losses suffered. If banks can show losses, they will have up to 60% of losses compensated.

The total cost of the retail data breach is approximately $179 million, although that figure does not incorporate all legal fees that Home Depot must pay, and neither does it include undisclosed settlements. The final cost of the retail data breach will be much bigger. It is already getting closer to the $200 million mark.

Then there is the reputation damage due to the breach. Following any data breach, customers often take their business to a different company. Many consumers impacted by the breach have chosen to shop elsewhere. A number of studies have been carried out on the fallout from a data breach. One HyTrust study states that companies may lose 51% of customers following a breach of sensitive data.