I’ve already managed a full data migration project from Sage 100 to Dynamics 365 Business Central (Cloud), so I can share some concrete best practices that helped ensure a smooth and clean transition.
Here are the most important best practices for migrating from Sage → Business Central:
✅ 1. Clean and prepare data before migration
Remove duplicates, close old documents, fix negative inventory, and standardize master data. Migration quality depends heavily on the quality of the source data.
✅ 2. Use staging files (Excel or Power Query) for mapping
Prepare clear mapping sheets for:
- Customers
- Vendors
- Items
- Posting groups
- Chart of Accounts
This avoids mismatches and makes validation easier.
✅ 3. Migrate only what you need
We usually avoid migrating full transaction history.
Historical transactions should only be loaded into a sandbox/environment to check and verify, not into the production database.
✅ 4. Focus on opening balances + open entries
This ensures continuity without polluting the new system with old transactions.
✅ 5. Run at least two mock migrations
This helps confirm the data structure, fix issues early, and shorten the final go‑live migration window.
✅ 6. Freeze the old system before the final load
This avoids new entries being created in Sage during the final migration.
🔎 Regarding historical data
Historical data is usually imported only into a test environment so the client can verify and consult old records.
In production, the recommended approach is:
- Migrate masters + opening balances + open entries
- Keep full historical data in an archive or Power BI for consultation
This is the approach that works best with Business Central and aligns with Microsoft recommendations.
