In a perfect world your servers would always be at the current cumulative update release. In reality, that does not always happen for a variety of reasons. When the CU is applied, the updates installed are removed and replaced by log files. This means that if you need to apply the CU to a rebuilt server after recovery, the files in the original install directory are useless. Older CU's are not available for download after they are superseded. It's a good idea to store the CU's in a separate rebuild directory with your certificates and other files needed to rebuild a failed server. You don't want to be forced into installing an untested CU on all your servers because you cannot bring one server up to your deployed version.
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