Phased Migration from 1C and BAS: How to Switch Without Stopping Your Business
Short answer: from our experience and the experience of our clients, migrating from a system that has been running for years is a highly non-trivial task that takes time and careful planning. At VlasnaCRM we developed a process that makes migration from 1C and BAS phased: the old system and the new CRM run in parallel for a while, processes are moved in blocks with data reconciliation, and the business keeps running smoothly with zero downtime the whole time.
Why migrating from 1C/BAS is non-trivial
A system a business has run for years is not just a piece of software. It is dozens of configured processes, a history of data, team habits and a multitude of small customizations that often only a few employees remember. That is exactly why trying to move everything in one big leap almost always ends in stress, errors and downtime.
From our experience and the experience of our clients, the main challenges of migration are:
Years of accumulated processes
Complex logicOver years of working in 1C/BAS you accumulate dozens of interconnected processes, customizations and exceptions. Migrating everything at once is a huge risk.
Large volume of data
History and balancesCustomer base, deal history, stock balances, documents from many years. The data must be migrated carefully, with reconciliation and no losses.
Team habits
Human factorEmployees have worked in a familiar interface for years. An abrupt change causes resistance and mistakes if the team is not given time to adapt.
Business continuity
Operations can't stopSales, shipments and accounting can't be paused. Any downtime means lost money and unhappy customers.
Our approach: phased migration
At VlasnaCRM we developed a process that turns a painful “move” into a manageable sequence of small steps. Instead of stopping the business and migrating everything at once, we break the migration into independent blocks and launch them gradually.
The core idea is simple: the business should not feel the migration. While the new CRM gradually takes over processes, the old system keeps running - so sales, inventory and accounting never stop for a single day.
The migration process step by step
Audit and process map
3-7 daysWe dive into your business: how you work in 1C/BAS, which processes are critical, what data and integrations are involved. We build a migration map with priority blocks.
Phased migration plan
3-5 daysWe split the migration into independent blocks (e.g. customers → sales → inventory → finance). For each block we define the order, the data and the readiness criteria.
Pilot block in production
2-3 weeksWe launch the first process in the new CRM in parallel with the old system. The team tries it on real tasks, we collect feedback and fine-tune.
Parallel work and expansion
from 3 weeks1C/BAS and the new CRM run at the same time. We gradually migrate the next blocks, reconciling data at every step - the business stays operational the whole time.
Final reconciliation and 1C/BAS shutdown
3-5 daysOnce all processes run in the new system and data is reconciled, we safely decommission the old system. You are fully independent of 1C/BAS.
The principle of parallel operation
The key to a zero-downtime migration is the parallel operation of the two systems. Here is what it gives your business:
- The old 1C/BAS stays operational while the new CRM gradually takes over processes
- The team learns the new system on real tasks without rushing
- Data is reconciled at every step - you can see that nothing is lost
- At any stage you can roll back to the old system with no risk
- We shut down the old system only when everything new works flawlessly
Phased vs one-time
| Criterion | One-time | Phased |
|---|---|---|
| Business downtime during migration | Yes | |
| Risk of data loss | High | Minimal |
| Time for the team to adapt | None | |
| Ability to roll back to 1C/BAS | ||
| Parallel operation of two systems | ||
| Data reconciliation at each stage | ||
| Control of results at every step | ||
| Stress and load on the team | Maximum | Moderate |
Planning a migration from 1C or BAS?
We'll build a phased migration plan tailored to your business, move your data and launch a custom CRM - with no downtime and no risk of losing data.
Frequently asked questions
Can you migrate from 1C or BAS without stopping the business?
How long does a phased migration from 1C/BAS take?
What happens to the old data from 1C and BAS?
Why is a phased migration better than a one-time switch?
Key takeaways
- Migrating from a system that has run for years is a complex task that takes time
- A one-time migration carries a high risk of downtime and data loss
- The VlasnaCRM phased process moves processes in blocks without stopping the business
- The old and new systems run in parallel, with data reconciled at every step
- The first working block goes live in as little as 2-3 weeks
- We shut down the old 1C/BAS only after full reconciliation of all processes