According to the Certified Information Security Manager (CISM) Study Guide, the greatest challenge to the recovery of critical systems and data following a ransomware incident is the availability and integrity of backups. If the backups are unavailable or corrupt, it becomes much more difficult, if not impossible, to recover the systems and data. This highlights the importance of regularly testing and verifying the backup and recovery process to ensure that the backups are available and can be used in the event of an incident. Additionally, it is important to ensure that backups are stored securely and off-line to prevent them from being encrypted or deleted by an attacker.

The best way to reduce the risk associated with a bring your own device (BYOD) program is to implement a mobile device policy and standard. This policy should include guidelines and rules regarding the use of mobile devices, such as acceptable use guidelines and restrictions on the types of data that can be stored or accessed on the device. Additionally, it should also include requirements for secure mobile device practices, such as the use of strong passwords, encryption, and regular patching. A mobile device management (MDM) solution can also be implemented to help ensure mobile devices meet the organizational security requirements. However, it is not enough to simply implement the policy and MDM solution; employees must also be trained on the secure mobile device practices to ensure the policy is followed.