One of the main protections I would implement as CISO to ensure the availability of systems is the use of backup servers that could temporarily handle the traffic load while the team performs quick maintenance on the main servers. These servers would not be able to completely take over the full load of the main servers, which would place emphasis and priority on getting the main servers back online. Because of this, I would create a plan for my team to follow to ensure that the response to issues with the main servers is efficient and effective in restoring smooth operations.