The BEST way to mitigate the high cost of retrieving electronic evidence associated with potential litigation is to implement policies and procedures for:

Data classification and labeling help organize data but do not inherently reduce the volume of data that must be retrieved for legal holds or discovery.

Data logging and monitoring are crucial for security and incident response, but they increase the volume of data, which could exacerbate evidence retrieval costs if not properly managed with retention policies.

Policies for data retention and destruction ensure that only legally required or business-critical data is kept, and irrelevant or outdated data is systematically removed. This reduces the overall volume of electronic data, drastically lowering the scope and cost of discovery efforts for litigation by minimizing the data that needs to be searched and reviewed.

Data mining and analytics are techniques for extracting insights from data, not for managing the lifecycle or volume of data in a way that directly mitigates retrieval costs during litigation.