Which activity should Alaina not restrict as part of her preparation for a change window?

Restricting the scaling of clustered systems up or down during a change window may not be advisable because this activity is often crucial for maintaining system performance and availability. Clusters are designed to handle load balancing and high availability, so scaling them appropriately can ensure that the systems can adapt to changing demand or to mitigate issues that arise during maintenance or upgrades.

In contrast, documenting existing settings is vital for ensuring that all configurations are clear and can be reverted if necessary. Communicating with stakeholders is critical to keep everyone informed about potential downtime and changes, while backing up system data is a fundamental safeguard that should always be part of any preparation for changes. These activities are essential to minimize risk and ensure a smooth transition. Thus, the correct choice indicates that scaling should not be restricted, as maintaining flexibility in this area is important for operational resilience during the change process.