Guide

Data migration: risks and how to limit them

What can go wrong with data migration, how likely each is, and which specifications can prevent it in advance — without dramatizing and without glossing over.

Quote on request2 to 6 weeksAs of 2026
In short

The biggest risk with data migration is not the technology, but that no one maintains the system after launch. Incorrect answers can be limited by working exclusively from verified content and escalating when uncertain; dependency is avoided by ensuring access, data and documentation remain contractually with the client.

01 — Risks

What can go wrong

  • The system answers incorrectly. Containable by having it work exclusively from verified content and escalate when uncertain rather than guess. This is a configuration decision, not a property of the technology.
  • The effort is underestimated. Most common reason: unclear starting situation. An honest assessment of the current state before the proposal prevents this more reliably than any buffer.
  • No one maintains it. The biggest risk of all — and the most easily avoidable.
  • Data protection gaps. Almost always arise from missing deletion deadlines and unclear responsibility, rarely from the technology itself.
  • Vendor lock-in. Avoidable if access credentials, data, and documentation contractually remain with the client.

02 — Warning signs

When to be skeptical

  • Guaranteed results. Anyone promising top Google ranking or a specific revenue increase is selling something they can't deliver.
  • No pushback. A provider who thinks every project is a good idea has either not listened or is only selling.
  • Time pressure. Limited-time discounts on project prices are a sales tool, not an offer.
  • Unclear ownership. Anyone who won't clearly say who owns data and access doesn't have your interests at heart.
  • No contact with technical expertise. If only sales sits in the first meeting, that's where misunderstandings arise.

03 — Contract

What needs to be clarified in writing

  • Ownership of data and access. They belong to the client. If a provider won't clearly confirm this, that's the most important information from the conversation.
  • Handover upon termination. In what format, within what timeframe, at what cost.
  • No minimum term without consideration. Lock-in is justifiable if something is delivered in return — otherwise not.
  • What a later change costs. The total cost isn't determined by the project price, but by the hourly rate in year three.
  • Documentation as a deliverable. Not as a promise, but as a line item in the proposal.

04 — Questions

Frequently asked questions

How long does a migration take?

The transfer itself usually hours. The time goes into analysis, rules, and trial runs — typically two to six weeks, depending on the condition of the legacy data.

What if something is missing after the switchover?

That's why count protocol and fallback option: the legacy inventory remains untouched until acceptance is complete. Subsequent additions of individual areas are possible.

Do we take everything?

Rarely makes sense. Dead records, test datasets, and ten-year-old transactions burden the new system. We recommend migrating the active inventory and keeping the rest archived and accessible.

What happens to attachments and documents on the record?

They are transferred along, provided the target system supports them. Where the format doesn't fit, it's clarified beforehand whether conversion is necessary or external storage remains more practical.

How do we ensure nothing gets lost?

Through the count protocol: number of records before and after is compared, samples are checked for content. Only after this acceptance is the migration considered complete.

Do we need access to both systems simultaneously for the migration?

Yes, at least for the period of trial runs and the actual switchover. After that, access to the legacy system can be restricted or terminated.

Can we keep working in parallel?

For short transitions yes, with a cutoff date. For longer migrations, you typically continue working in the legacy system until the switchover and transfer the additions at the end.

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