Data migration is the transfer of business information from an older system into a new platform, followed by validation to confirm the records arrived intact and usable. In practice, this means moving customer files, financial records, permissions, and other operational data without breaking formats, relationships, or business rules.
In cyber security, data migration is a high-risk moment because sensitive data often crosses temporary tools, scripts, and staging environments. Weak controls can expose credentials, leak personal data, or introduce corrupt records that disrupt access and logging. Attackers may target migration windows to steal data in transit or exploit rushed permissions. Defenders reduce risk with inventory, encryption, least-privilege access, checksum and reconciliation checks, backup verification, and testing in nonproduction environments. A secure migration is not just about copying data; it is about proving the new system contains accurate, complete, and protected information.