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Data Migration Testing
Independent verification that every record survives the journey. We reconcile source to target with zero data loss, validate history and business rules, and stand guard over data integrity after go-live.
Overview
Prove every record survives the move, with the evidence to show it
Data Migration Testing is independent verification that every record survives the journey from the old system to the new one. We reconcile source to target for zero data loss, validate historical data and business rules, and stand guard over data integrity after go-live. It is built for regulated and high-growth organisations replacing a core platform, consolidating systems or moving to the cloud, where a migration that quietly drops or mangles records can undermine reporting, compliance and customer trust for years.
Migrations are one-way doors, and the riskiest failures are the silent ones: a truncated field, a mishandled date, a subset of history that never arrived. Work with Baknet and one team stays accountable across security, data assurance, software QA and people, so migration risk has a single owner rather than falling between the implementation team and the business. Our method is evidence-led: reproducible findings, fixes proven to hold, a single included retest and progress reported daily. As an organisation certified to ISO/IEC 27001 and ISO 9001, we bring the same discipline to your data that we hold ourselves to.
What it includes
Four capabilities, one accountable service
Source-to-Target Reconciliation
We confirm zero data loss during migration using row counts, control totals and checksums, comparing what left the source against what arrived in the target. This is proof rather than assumption: where a count or checksum fails to match, we isolate the records at fault and trace the break to its cause.
Historical Data Validation
Legacy and archived data is often the hardest part of a migration and the easiest to overlook. We verify it for completeness, accuracy and retention compliance, so records going back years arrive intact and correctly structured, and the target holds what the organisation is required to keep.
Business Rule Verification
A migration is rarely a straight copy. We validate the transformations, mappings and derived fields in the post-migration estate, checking that reference data maps correctly, that derived values recalculate as intended, and that the business logic embedded in the old system carries across faithfully to the new one.
Post Go-Live Assurance
The risk does not end at cutover. We run data integrity checks after go-live to keep business operations stable and uninterrupted, catching any drift or late-surfacing issue before it reaches customers or reporting. This gives the business a stable, evidenced landing rather than an anxious wait to see what breaks.
How we deliver
A disciplined path from baseline to hypercare
Success is defined up front, hardened through every rehearsal, certified at go-live and assured until operations are proven stable.
01
Baseline the Source
We profile the data and agree reconciliation rules, control totals and acceptance thresholds before cutover, so success is defined up front rather than argued about later.
02
Validate Each Mock Run
We execute reconciliation and business-rule checks on trial migrations and harden the process iteratively, so every rehearsal makes the real event safer.
03
Certify the Cutover
Full row-count, checksum and derived-field validation at go-live, with documented evidence to support sign-off.
04
Assure Post Go-Live
We monitor integrity through hypercare until business operations are proven stable. Daily progress updates run throughout and one retest round is included.
It is the same disciplined path we use across the practice. See how we work on How We Engage.
Why it pays off
Why Data Migration Testing pays off
Zero-Loss Certainty
You get checksummed, evidenced proof that no record was lost or corrupted in the move, not a hopeful assumption. Every reconciliation result is documented, so a clean migration can be demonstrated to auditors and stakeholders alike.
De-Risked Cutover
Issues surface in mock runs, not on go-live weekend, which protects the migration timeline. Each rehearsal hardens the process, so the final cutover proceeds from tested confidence rather than crossed fingers.
Retention Compliance Intact
Historical and archived data is validated against completeness and regulatory retention obligations, so legacy records arrive fully accounted for and the organisation stays audit-ready long after the move.
Business Continuity Protected
Post go-live assurance catches integrity drift before it disrupts operations or reporting, so problems found during hypercare are resolved quietly while the business keeps running as normal.
Migrate once, migrate right, with the evidence to prove it.
What you receive on every engagement
Daily Progress Updates
Source-to-Target Reconciliation
Quality Scorecards
Documented Go-Live Evidence
One Included Retest
Questions, answered
Frequently asked
When should migration testing start?
Before the first mock run. Baselining the source and agreeing reconciliation rules early means every trial migration hardens the process instead of merely rehearsing it, and problems are found while there is still time to fix them cheaply.
Can you certify migrations performed by another vendor?
Yes, and independence is the point. We verify any implementation partner’s migration with our own reconciliation evidence, giving you an objective view that does not depend on the team that carried out the move.
What does post go-live assurance cover?
Integrity monitoring through the hypercare window: drift checks, reconciliation re-runs and defect triage, continuing until business operations are demonstrably stable rather than just presumed to be.
Will testing slow down our cutover?
No. Because acceptance thresholds are agreed up front and checks are built to run repeatably, validation runs alongside the migration and gives a fast, evidenced yes or no at go-live rather than holding the programme up.
What do you need from us to begin?
Access to representative source and target environments, the migration and mapping specifications, and a nominated point of contact on your side. From there we profile the data and agree reconciliation rules and acceptance thresholds, so the scope is clear before any testing begins.
What standards and methods do you follow?
Our approach follows established data assurance and quality practices, with reconciliation, control totals and checksums as the backbone of every engagement. As an organisation certified to ISO/IEC 27001 and ISO 9001, we apply consistent, documented methods rather than ad hoc checks.
How do you protect the confidentiality of our data?
Confidentiality is treated as a first-class concern. We work under a non-disclosure agreement, handle data within your controls and environments wherever possible, and our ISO/IEC 27001 certification underpins how we protect information throughout the engagement.
What deliverables do we receive?
You receive documented reconciliation results, data quality reporting, a record of the checks executed and clear go-live evidence to support sign-off. Daily progress updates run throughout, and one retest round is included so every fix is verified rather than taken on trust.
How does this fit with our in-house team and implementation partner?
We work as an independent assurance layer alongside your internal team and whichever partner is carrying out the migration. Because we own the verification, migration risk has a single accountable owner rather than falling between the implementation team and the business.
How is the engagement priced?
Each engagement is scoped to your source, target and cutover plan, so pricing reflects the size and complexity of the migration rather than a fixed package. Share your context and we will return a clear, obligation-free proposal.
Also in Data Confidence: Data Warehouse & BI Testing · Data Quality & Validation · Data Advisory & Strategy · Data Pipelines & Continuous QA
Ready to migrate once and migrate right?
Share your context and constraints and we will return a clear, evidence-driven proposal, scoped to your source, target and cutover plan, with no obligation.