When your institution faces a core conversion, merger, or imaging system replacement, it’s tempting to assume your internal team can handle the legacy data migration. After all, it’s your data — how hard can it be?
The answer, based on FIntegrate’s 25+ years and 5,000+ successful conversions across banks and credit unions: far harder, far riskier, and far more expensive than most institutions expect.
Here’s what a DIY approach actually requires — and where it breaks down.
Legacy data conversion is not a simple file transfer. Your historical archives — check images, loan documents, signature cards, statements, corporate resolutions, and all the required indexes, mapping and meta data — are locked inside systems with proprietary formats, inconsistent metadata, and undocumented quirks.
A DIY conversion requires your team to:
Source systems store data in tables, objects, file formats, and APIs that don’t map cleanly to your go-forward system. Understanding primary keys, foreign keys, referential integrity, and system-generated values across both old and new platforms demands deep, specialized knowledge. A “standard” file extract like X9, does not mean it will import properly into the new system as all files and formats have custom mappings and fields.
Field-to-field mapping between source and target, date format translations, handling nulls and defaults, conditional logic, and code translations — all must be defined, built, and tested. A single mapping error can corrupt thousands of records, which could corrupt your known good archive or at the very lease require you to back out the data (unload it) correct the issues then reload. All this takes a lot of time and can result in duplicate data or worse data that’s unable to be found once it’s loaded.
Duplicates, orphaned records, corrupt images, missing metadata, unindexed documents, and broken image pairings (front/back) are the norm, not the exception. Most institutions don’t discover these problems until they’re deep into the project.
Extracting from legacy databases, transforming with SQL or custom scripts, loading in the correct dependency order, managing batch sizes and error handling — this is a full-time engineering effort that competes with your team’s existing workload and skill sets.
Row counts, spot checks, referential integrity, image pairing verification, reconciliation reporting, and business user sign-off must all occur before you can trust the migrated data. FIntegrate runs automated hash/ID verification, image matching, and de-duplication, account number mapping and duplication checks — capabilities most internal teams would need to build from scratch.
Even before you start converting, you’ll face two rounds of vendor fees:
Your legacy vendor typically charges a significant fee just to export your own data — and the output may be incomplete or inconsistently formatted.
Your new system’s vendor charges again to import the data, a process that can take months of mapping and validation and still produce partial or inconsistent results for data which , you are required to keep, however you may rarely access after the cutover.
You end up paying twice for the same data, bearing all the risk if something goes wrong. And if you choose to leave data in the legacy system instead? Ongoing hosting fees can quickly become very expense for the lifetime you have to maintain the data but rarely accessed.
Legacy data isn’t just operational — it’s regulatory. FDIC, OCC, and NCUA retention mandates require your institution to produce historical records for research, subpoenas, audits and examinations. A botched conversion can leave you unable to respond to legal or auditors, expose PII through insecure handling, or create gaps in your audit trail.
FIntegrate’s FusionLRS platform is built around compliance from day one: encrypted data in transit and at rest, role-based access controls, detailed access logs, and complete reconciliation reports that document every record’s chain of custody.
Your internal team would need to design and implement all of these controls independently — a significant compliance project on top of the conversion itself.
Every hour your IT team, operations staff, and project managers spend on DIY conversion is an hour not spent on the core conversion itself, serving customers, or running the bank. Legacy data projects routinely consume 6–12 months of effort, with complexity scaling across every source system (core, LOS, imaging, check archive, wire, branch systems, mortgage, cards, and more).
FIntegrate’s dedicated team manages the entire lifecycle — from vendor handoffs and data exports to milestone checkpoints and post-conversion validation — so your people stay focused on the transition, not on data archaeology.
| Capability | DIY | FIntegrate |
| 25+ years of banking data conversion experience | No | Yes |
| 5,000+ financial institutions have trusted FIntegrate staff to ensure successful data and image conversions | No | Yes |
| Pre-built compatibility with Fiserv, FIS, Jack Henry, CSI, DCI, Synergy, OnBase, Nautilus and many others | No | Yes |
| Automated de-duplication, image matching, and QA workflows | Build from scratch | Included |
| Three flexible options:
Full conversion to your new system Hybrid – take only the data needed for immediate, day one or later access Brower-Based Migration – browser access to all data and indexes enterprise wide. The data never leaves your secure environment. |
One path or nothing | Yes |
| Audit-ready reconciliation and certification packages | Build from scratch | Included |
| White-glove project management with vendor coordination | Your team absorbs this | Included |
| Flat-fee, predictable pricing | Unknown costs | Yes |
Unlike a DIY approach where you’re locked into a full data conversion, or nothing, FIntegrate offers three proven options:
All legacy data and images are converted into your go-forward system. Most seamless end-user experience, handled efficiently by FIntegrate’s automated pipelines rather than manual internal effort.
Convert only high-value, frequently accessed data (recent check images, commercial loan docs, signature cards). The rest is stored in a searchable, secure archive. This approach can reduce costs by 50–70% versus a traditional full conversion.
All historical data is loaded into FusionLRS’s secure browser on your local infrastructure. Staff can research, print or email legacy data without converting or reformatting anything. This is typically the fastest, lowest-cost, and least disruptive path — and it’s an option no DIY project can replicate without building an entire application.
“For a company to pivot like that at the end and say ‘no worries, no stress, let us do it for you’ — that was especially valuable during such a big conversion.” — Christy Mavers, First Oak Bank
“When you have a specialized team like FIntegrate, you get that custom-tailored experience, which they definitely delivered on.” — Austin B. Niblett, American National Bank
Let’s discuss your upcoming conversion. Please contact us at Sales@fintegratetech.com
