Software migration is easiest when it is treated as an operating-model transition rather than a file import. Before data moves, the business needs to know which records matter, who owns them, which relationships must survive, and what will remain in the old system.
Most operations have several partial sources of truth: booking channels, spreadsheets, task tools, receipts, shared drives, accounting platforms, and operator memory.
Migration readiness starts by identifying which source currently owns each responsibility and where duplicates or contradictions already exist.
Property records, reservations, contacts, financial evidence, documents, tasks, historical notes, and integration credentials should not be migrated with the same method or retention rule.
Classifying the data first makes it possible to decide what must be imported, linked, archived, transformed, or deliberately left behind.
Migrating contradictory data preserves the contradiction in a new system. Key identifiers, current reservations, balances, property mappings, and active tasks should be reconciled before or during transition.
Historical perfection is not always necessary, but unresolved differences should be documented rather than silently normalised.
A go-live plan should explain what happens if a critical workflow fails after cutover and how the team can access retained historical records.
Reversibility does not mean running every old and new system forever. It means preserving enough evidence and access to recover safely from a failed transition.
Identify where each important operational record currently lives and which source is authoritative.
Separate import, transform, archive, retain-only, and do-not-migrate data.
Check key identifiers, relationships, active bookings, balances, documents, and open work.
Test the migration path and go-live checklist with realistic data before the final switch.
Verify critical workflows after go-live and retain enough prior-system access for controlled recovery.
The migration plan begins with exporting everything into CSV.
Nobody can identify which system is authoritative for current reservations.
Historical duplicates are being silently merged without a rule.
The go-live plan has no rollback, retained-access, or reconciliation step.
Current systems and responsibilities are mapped.
Data is classified by operating purpose and retention need.
Critical records and relationships are reconciled.
Credentials/secrets are handled separately from normal business data.
Cutover, validation, retained access, and rollback responsibilities are explicit.
Migration scope depends on source-system export capability, data quality, contractual restrictions, integration availability, and the target product release. No fixed timeline or zero-disruption outcome should be assumed without validating those conditions.