--- title: How to Avoid a Duplicate Disaster When Migrating to HubSpot description: Migrating to HubSpot? Here's how to prevent duplicate records, preserve record IDs, and arrive with clean data. image: https://koalify.io/hubfs/How%20to%20Avoid%20a%20Duplicate%20Disaster%20When%20Migrating%20to%20HubSpot.png --- [Skip to content](https://koalify.io/blog/how-to-avoid-a-duplicate-disaster-when-migrating-to-hubspot#main-content) [![rectangle\_long\_koala\_with\_name\_bold\_200\_125\_white](https://koalify.io/hubfs/rectangle_long_koala_with_name_bold_200_125_white.png)](https://koalify.io) - Products Show submenu for Products - [Deduplication](https://koalify.io) - [Email Validation](https://koalify.io/hubspot-email-validation) - Pricing Show submenu for Pricing - [Deduplication](https://koalify.io/pricing) - [Email Validation](https://koalify.io/hubspot-email-validation-pricing-koalify) - [Partners](https://koalify.io/partners) - [Blog](https://koalify.io/blog) - Knowledge base Show submenu for Knowledge base - [Deduplication](https://koalify.io/knowledge-base) - [Email Validation](https://koalify.io/email-validation-knowledge-base) - Products Show submenu for Products - [Deduplication](https://koalify.io) - [Email Validation](https://koalify.io/hubspot-email-validation) - Pricing Show submenu for Pricing - [Deduplication](https://koalify.io/pricing) - [Email Validation](https://koalify.io/hubspot-email-validation-pricing-koalify) - [Partners](https://koalify.io/partners) - [Blog](https://koalify.io/blog) - Knowledge base Show submenu for Knowledge base - [Deduplication](https://koalify.io/knowledge-base) - [Email Validation](https://koalify.io/email-validation-knowledge-base) ![menu-toggle](https://21645388.fs1.hubspotusercontent-na1.net/hubfs/21645388/menu-toggle.svg) ![menu-close](https://21645388.fs1.hubspotusercontent-na1.net/hubfs/21645388/menu-close.svg) [Get Started Free](https://api.koalify.io/hubspot/install?utm_source=koalify&utm_medium=website&utm_campaign=navigation) [HubSpot Data Quality](https://koalify.io/blog/tag/hubspot-data-quality) # How to Avoid a Duplicate Disaster When Migrating to HubSpot [By \- Jonas,](https://koalify.io/blog/author/jonas) Oct 08, 2025 ![ Featured Image](https://koalify.io/hs-fs/hubfs/How%20to%20Avoid%20a%20Duplicate%20Disaster%20When%20Migrating%20to%20HubSpot.png?width=1536&height=1024&name=How%20to%20Avoid%20a%20Duplicate%20Disaster%20When%20Migrating%20to%20HubSpot.png) Migrating to HubSpot is exciting — new workflows, automation, cleaner data… right? Until the first week after go-live, when: 💬 Sales sees two of the same company. 💬 Marketing emails the same contact twice. 💬 Support can’t tell which record is the right one. It happens all the time — and the result is almost always the same: **people stop trusting the CRM.** Bad data kills adoption faster than a slow internet connection. So if you’re planning (or in the middle of) a migration to HubSpot, here’s how to keep your data — and your team’s trust — intact. --- ## 1️⃣ Import Original Record IDs Your first rule: **never lose the original record IDs** from your source systems. Those IDs are your anchor points for everything that happens after go-live — reimports, updates, troubleshooting, or mapping associations like activities and deals. ### Why it matters: Without the original ID, HubSpot can’t always tell which imported record belongs to which entity in your old system. That’s when duplicate creation starts to snowball. ### Best practice: - Create a custom property in HubSpot for each source system (e.g., *Salesforce Record ID*, *ERP Customer ID*, *Freshsales Contact ID*). - Always include it during your import process. - Use these IDs as your unique identifiers for future updates or bulk reimports. This simple step can save you hours of manual cleanup later. --- ## 2️⃣ Avoid Premature Merges This is one of the biggest mistakes during migrations. You import data from multiple systems — and it’s tempting to start merging right away to “clean things up.” Don’t. ### Why it matters: If you merge too early, you’ll break critical links that depend on your original system’s record IDs (like activities, notes, or associations). Once they’re gone, you can’t reattach them. ### What to do instead: - Keep records from each system separate until **all** related data (activities, deals, tickets, etc.) is imported and validated. - Use a naming or tagging convention (like *Source = Salesforce* or *Source = ERP*) so you can easily filter and manage each dataset. - Only merge once you’ve confirmed that associations are in place and everything has synced correctly. Think of it like moving into a new house — unpack everything first, then start rearranging the furniture. --- ## 3️⃣ Create Custom Deduplication Rules Every business has unique data patterns — so your deduplication logic should match that reality. Instead of relying only on HubSpot’s default rules (which primarily match on email or domain), create **custom rules** that reflect your actual data structure. ### Examples: - Contacts: *First name + last name + phone number* - Companies: *Company name + VAT number* or *Company name + country* - Deals: *Deal name + associated company* Then, determine which record should be treated as the **primary** record. Usually, you’ll want to merge *into* the imported record (not overwrite it) — that’s the one tied to your original system. ### How to automate this: [**Koalify 🐨**](https://koalify.io) makes this process easy. You can create flexible, rule-based deduplication workflows that automatically merge duplicates based on your chosen criteria — safely, without guesswork. Koalify’s approach helps you avoid merging unique records too early, and gives you visibility into what’s being merged, when, and why. --- ## 4️⃣ Plan a Cleanup Phase Data migrations aren’t one-and-done — they’re a **process.** Even if you do everything right, there will still be outliers, old records, and weird one-off cases. That’s completely normal. ### Best practice: - Allow at least a **one- to two-week “cooldown” period** after your first import. - Let data sync, workflows run, and users start interacting with the CRM. - Then, run your first major deduplication or cleanup round. By waiting, you ensure that: - New data has settled (and new duplicates are visible). - You can see patterns of recurring errors before automating merges. - Your cleanup won’t conflict with other syncs or workflows running in parallel. A calm cleanup beats a chaotic one every time. --- ## 5️⃣ Keep Everyone Informed Data quality isn’t just an ops problem — it’s a **trust** problem. If your sales team sees duplicate accounts or missing contacts with no context, they’ll immediately lose confidence in the system. And once that happens, adoption plummets. ### What to do: - Be transparent during migration. Tell teams what’s happening and when. - Explain that duplicates may appear temporarily — and share the cleanup plan. - Give visibility: dashboards, reports, or even Slack updates to track progress. When users know what’s going on, they stay confident — and patient. --- ## 🧩 Final Thoughts Migrating to HubSpot successfully isn’t just about moving data — it’s about building trust in your new CRM. That means thinking beyond import files and workflows: ✅ Retain source IDs. ✅ Merge smartly (not early). ✅ Automate safely with custom rules. ✅ Let your data breathe before cleanup. ✅ Keep everyone in the loop. Do this right, and your team won’t just *use* HubSpot — they’ll **trust** it. And when that happens, your CRM becomes what it was always meant to be: **a single source of truth.** ###### Category - [HubSpot Data Quality](https://koalify.io/blog/tag/hubspot-data-quality) - [HubSpot Email Validation](https://koalify.io/blog/tag/hubspot-email-validation) - [HubSpot Revenue Operations](https://koalify.io/blog/tag/hubspot-revenue-operations) - [HubSpot Integration Duplicates](https://koalify.io/blog/tag/hubspot-integration-duplicates) - [HubSpot Associations](https://koalify.io/blog/tag/hubspot-associations) - [HubSpot Deduplication](https://koalify.io/blog/tag/hubspot-deduplication) ###### Popular Post - [HubSpot best practices for contacts that leave a company](https://koalify.io/blog/hubspot-best-practices-for-contacts-that-leave-a-company) - [How to Bulk Merge HubSpot Duplicates: Contacts, Companies, Deals and More](https://koalify.io/blog/how-to-bulk-merge-hubspot-duplicates-contacts-companies-more) - [How to Merge Companies in HubSpot (Safely, Manually or in Bulk)](https://koalify.io/blog/how-to-merge-companies-in-hubspot-manual-or-in-bulk) - [HubSpot Deduplication: How to Find, Manage, and Remove Duplicates in HubSpot](https://koalify.io/blog/hubspot-deduplication-the-ultimate-guide-to-zero-duplicates-in-hubspot) - [How to Merge Duplicate Contacts in HubSpot Without Losing Data](https://koalify.io/blog/how-to-merge-contacts-in-hubspot-manual-or-in-bulk) ### Similar Blogs ![How to Merge Duplicate Projects Records in HubSpot](https://koalify.io/hs-fs/hubfs/How%20to%20Bulk%20Merge%20HubSpot%20Projects%20Duplicates%20with%20the%20Koalify%20Workflow%20Action.jpg?width=352&name=How%20to%20Bulk%20Merge%20HubSpot%20Projects%20Duplicates%20with%20the%20Koalify%20Workflow%20Action.jpg) #### [How to Merge Duplicate Projects Records in HubSpot](https://koalify.io/blog/how-to-merge-duplicate-projects-records-in-hubspot) By [Jonas](https://koalify.io/blog/author/jonas) 21 April 2026 Professional services teams use the Projects object to keep delivery separate from deals and... [READ MORE](https://koalify.io/blog/how-to-merge-duplicate-projects-records-in-hubspot) ![How Fathom AI Merged 13,000 Duplicate Companies in HubSpot in 3 Hours](https://koalify.io/hs-fs/hubfs/How%20Fathom%20AI%20Merged%2013%2c000%20Duplicate%20Companies%20in%20HubSpot%20in%203%20Hours%20V2.png?width=352&name=How%20Fathom%20AI%20Merged%2013%2c000%20Duplicate%20Companies%20in%20HubSpot%20in%203%20Hours%20V2.png) #### [How Fathom AI Merged 13,000 Duplicate Companies in HubSpot in 3 Hours](https://koalify.io/blog/fathom-ai-hubspot-duplicate-company-case-study) By [Jonas](https://koalify.io/blog/author/jonas) 17 February 2026 When CRM data gets messy, teams usually learn to live with it. 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