With news of crippling cyberattacks against big companies making regular headlines, more and more law firms are buying cyber insurance to cover the cost of a data breach.

According to insurance brokerage Aon, more than 60 out of the 250 medium and large law firms that it services have purchased cyber insurance within the last two years. Marsh said that close to 40 percent of its roughly 100 large law firm clients have purchased the insurance, up from 20 percent two years ago.