Institute for Critical Infrastructure Technology report details how to deal with criminals when they are holding your data hostage. Ransomware is obviously analogous to kidnapping, and dealing with the perpetrators can feel much like negotiating with a jumper standing on the edge of a high-rise roof. If the system is backed up, and the backup remains reliable, then the victim can ignore the ransom demand and restore the system according to the backup. Some attackers may release the system after receiving payment because doing otherwise would reduce the likelihood that other victims will pay.”]
Source: https://www.csoonline.com/article/3152775/what-to-do-if-your-data-is-taken-hostage.html