Data Migration
Data migration cleans, de-duplicates, maps and reconciles your existing records — spreadsheets, Tally, a legacy database — before loading them into a new or reconfigured system. GullySystem treats this as its own stage, not a rushed step before go-live.
What Data Migration Covers
This is the work of taking your existing records — customer lists, item masters, transaction history, opening balances — and preparing them for a new or reconfigured system: cleaning, de-duplicating, mapping fields to the new structure, and reconciling totals before anything goes live.
Why Migrations Go Wrong When Rushed
The Same Record, Several Times Over
An educational institute's student and fee records built up across years of admissions carry the same student under slightly different spellings, so a straight upload just moves the duplication into the new system.
Fields That Do Not Map Cleanly
A spreadsheet column called 'status' means something different in every sheet it appears in, and mapping it to a single field in the new system without checking produces records that are technically complete and factually wrong.
Balances Loaded Without Reconciliation
Opening balances are uploaded over a go-live weekend without checking them against the ledger, so the first month's reports do not tie out and nobody trusts the new system's numbers.
How We Approach a Migration
Assessment and Field Mapping
Every source — spreadsheets, exports, legacy databases — is reviewed, and each field is mapped to its place in the new structure before anything is moved.
Cleaning and De-duplication
Duplicate customers, items and vendors are identified and merged, and formats are standardised, so the new system starts from one clean version of each record.
Trial Migration in a Test Environment
Data is migrated into a test copy first, so problems surface and get fixed before your live system is touched.
Reconciliation Against Your Books
Counts and balances in the migrated data are checked against your existing ledgers and registers, with a named owner from your side confirming each set before cutover.
What Happens to Your Old Records
- Kept read-only and accessible for reference after cutover
- Not deleted or overwritten as part of the migration
- Available to compare against if a discrepancy turns up later
What Shapes Migration Cost and Timeline
- Number of source systems and how consistently they were maintained
- Volume of records and how much duplication or inconsistency exists
- How many fields require custom mapping rather than a direct match
- How quickly your team can confirm which version of a record is correct
Frequently asked questions
Can you migrate from Excel and Tally at the same time?
Yes, spreadsheets, Tally exports and legacy databases are common combined sources, and we map all of them into one consistent structure in the new system rather than migrating each separately.
What happens to duplicate customer or item records?
They are identified and merged before migration, with one clean record replacing several inconsistent versions, rather than carrying the duplication into the new system.
How do you make sure the numbers are right after migration?
Counts and balances in the migrated data are reconciled against your existing ledgers and registers, with a named person from your team confirming each data set before we treat the migration as complete.
Will our old records still be available after we switch over?
Yes, they are kept read-only rather than deleted, so you can refer back to them if a discrepancy comes up later.
Is migration tested before it touches our live system?
Yes, a trial migration runs in a test environment first, so mapping errors and data problems are found and fixed before anything is loaded into the system you actually use.
What do you need from our team?
Access to every source file or system, and one named owner per data set — customers, items, transactions — who can confirm which version of a record is the correct one when duplicates turn up.
Tell us what you need.
Send a short brief and one of our engineers will come back to you — usually the same day.
- No obligation
- We reply the same working day
- Your details stay private