Data leaks are a serious concern for companies of all sizes; if one occurs, it may put them out of business permanently. A data leak is defined as the inadvertent exposure of sensitive information to unapproved parties. Under the EU s General Data Protection Regulation, data leaks can incur fines of up to 20 million or 4 percent of annual global turnover, and damage reputations and trust. Data exfiltration is one of the final stages of the cyber kill-chain and the most important objective of advanced persistent threats (APTs)
Source: https://threatpost.com/data-exfiltration-prevent-it/167413/