Make regular back-ups of your important data
Making regular and comprehensive back-ups of data is the only good assurance against an infection or an attack that would corrupt the production data or render it inaccessible. Data restoration tests show the resilience and capacity to roll back to a healthy situation.
Each system is automatically backed-up on at least a weekly basis, and more often for systems storing critical information, according to your backup policy.
Regularly check that your back-ups are still being made every day and are recoverable.