What should each organization have that spells out which systems are prioritized in what order for the basis of protecting those systems from disasters?

The answer is Recovery strategies. Volume 2, Unit 1, Section 209 Contingency Planning says, "A contingency plan should spell out what systems are prioritized in what order for the basis of protecting those systems from disasters and contingency and for bringing those systems back online after a disaster/contingency. By prioritizing these recovery strategies, the network administrator may make more informed, tailored decisions regarding contingency resource allocations and expenditures."