[PCI DSS 3.0] 6.4.5.4 Back-out procedures.

6.4.5.4 Back-out procedures.

6.4.5.4 Verify that back-out procedures are prepared for each sampled change.

For each change, there should be documented back-out procedures in case the change fails or adversely affects the security of an application or system, to allow the system to be restored back to its previous state.