Maintain an inventory of all ICT equipment and software licenses
Keeping an inventory of your IT assets allows you to understand the scope of your essential assets and to check your maintenance contracts. It also helps you to identify those resources that are no longer used but have not yet been decommissioned.
Keep this inventory up to date. If there is an incident, it can help you to detect where the problem comes from and potentially which supplier you need to contact. Do not entrust this task to external staff, as you need to remain in control of the situation.