Planning to adopt HubSpot
Years of records in a legacy CRM and no appetite for losing any of it
The fear is rational. A migration is one of the few IT projects where a mistake is both irreversible and immediately visible to everyone in the company. The answer is not reassurance — it is a process that proves, record by record, that nothing was lost.
Short answer
How do you migrate a CRM to HubSpot without losing data?
By making the migration verifiable rather than hopeful. Every record type is mapped field by field to a HubSpot object before extraction. A full dry run loads the data into a sandbox portal, where counts and key values are compared against the source. Production runs in reconciled batches, each one checked before the next begins, and a reconciliation report matching source and destination counts and field values is signed off before the legacy system is retired. The old system stays available read-only for a defined period as a rollback path. We have moved more than 70,000 records in a single engagement this way.
01
How this shows up
If four or more of these are true, this is your problem.
- A legacy CRM nobody wants to touch but nobody wants to lose
- Years of notes, emails and attachments with unclear ownership
- Custom fields and objects with no obvious HubSpot equivalent
- Previous migration attempts that stalled or half-completed
- Compliance requirements on retention you must not breach
- No one internally who has run a migration before
02
Why it happens
Mapping done during the load
Migrations fail when field mapping is improvised mid-import. Every decision has to be made and reviewed before extraction starts.
No dry run
A production-first migration gives you no chance to see what a mistake looks like before it is permanent.
Associations treated as an afterthought
Records migrate easily; relationships between them do not. Losing associations makes the data technically present and practically useless.
No reconciliation
If nobody counts what arrived against what left, 'nothing was lost' is an assumption rather than a fact.
03
What it costs you
Records migrated
70k+
Largest single engagement
Data integrity
100%
Reconciliation report signed off
Weeks
4–8
Typical migration
Rollback plan
1
Documented before cutover
Done properly, a migration is boring. The engineering effort goes into making it boring: mapping documents, sandbox runs and reconciliation, so that cutover day is a scheduled event rather than a gamble.
04
How we fix it
- 01
Inventory and map
Every object, field, custom property, attachment type and association in the source system is catalogued and mapped to a HubSpot destination, with decisions recorded for anything that has no equivalent.
- 02
Decide what does not move
Not all history is worth migrating. Archive rules for obsolete records keep the new portal clean and reduce risk, with the archive retained for compliance.
- 03
Dry run into a sandbox
A full load into a sandbox portal, reviewed by your team against real examples they recognise, before anything touches production.
- 04
Reconciled production load
Batched loads with counts and key field checks at each step, and a final reconciliation report you sign off.
- 05
Keep the rollback path
The legacy system stays available read-only for an agreed period, so there is always a way back to the source of truth.
05
What changes afterwards
- Every record accounted for, with a document proving it
- Associations, owners and history intact in the new portal
- A clean HubSpot instance rather than a copy of the old mess
- A defined retirement date for the legacy system, chosen not forced
Services that solve this
Questions
People ask us this
Can you migrate from Salesforce, Pipedrive or a custom CRM?
Yes. We have migrated from Salesforce, Pipedrive, Zoho, legacy ticketing systems and bespoke databases. Where an API exists we use it; where it does not, we work from exports with the same mapping and reconciliation discipline.
Do emails, notes and attachments come across?
Usually yes, subject to what the source system exposes. Which of them are worth migrating is a scoping decision — attachments in particular can be large and are sometimes better archived than moved.
What happens if something is wrong after cutover?
The legacy system remains available read-only through hypercare, so any gap can be checked against the source and corrected. That is why we do not retire the old system on go-live day.
Planning to adopt HubSpot
Related challenges
Don't know where to start
Overwhelmed by hubs, tiers and setup choices
No training plan
Nobody on the team has run a CRM rollout before
Need it live fast
Contract expiring, migration deadline looming
Next step
Tell us what is actually going wrong
Thirty minutes, no pitch deck. We will tell you whether this is a quick fix, a project, or something you can do yourself.