The problem todayVendor migration tools move the data but drop custom fields, history and the links other systems relied on.
- Mapping workbookEvery field, picklist and custom value is mapped, including the ones the vendor's tool ignores.
- Repeatable dry runsScripted loads into a test environment produce reconciliation reports (counts, totals, samples) that your staff sign off on.
- ID crosswalkOld and new IDs are stored together, so integrations, reports and document links keep working.
- Delta cutoverA final catch-up load covers anything that changed since the last full run, so downtime is short.
A migration you can verify, with your integrations still working on day one.