Disaster recovery plan

Sometimes it's not technically or physically feasible to conduct a complete real-world test of a disaster recovery plan.1. Describe a recovery that would not be feasible to test with a real-world test. Include the reason(s) that the real-world test could not be done. 2. Elaborate on the steps and processes you would have to do to try to insure that your recovery plan would work in the event of a disaster.