How to Manage Data Gaps During a System Migration Cutover

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System migrations rarely account for the gap period between the final data export and the new system going live, during which business operations continue. To manage this, the old system should be set to read-only on the day of the final export, allowing staff to access historical records without making changes. Any new data created during the gap should be captured in a structured spreadsheet designed to match the new system's import format exactly, enabling a fast bridge import once the new system is live. A timed rehearsal of the full cutover sequence — not just a data dry run — is essential to confirm the process fits within the allotted window. These steps distinguish a smooth, professional migration from one that feels like an unplanned outage to the client's staff.

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