Which guide should be used as the last option when repairing a system?

The most appropriate guide to use as the last option when repairing a system is the recovery guides. Recovery guides are specifically designed to help restore systems following a failure or compromise. They typically contain detailed procedures for recovering data, restoring configurations, and bringing the system back to an operational state after an incident. This makes them essential when other corrective measures have not worked, or when significant issues necessitate a more comprehensive recovery approach.

Utilizing recovery guides ensures that technicians follow informed, structured processes to reduce the risk of further damage during repairs. As these guides focus on restoring functionality from a broader system-wide perspective, they are seen as a final resort to help ensure that all aspects of the system's operational status are addressed.

The other types of guides may provide useful information under different circumstances. Configuration guides focus on setting up system parameters, admin guides typically cover administrative tasks and ongoing management, while backup guides primarily deal with the processes of backing up and archiving data. While these guides are valuable in maintaining system health or preventing issues, they are not specifically aimed at recovery and should be used prior to recovery guides when addressing system failures.