Migration

A migration is the transfer of an existing system to a new environment: change of technology, hosting, CMS, database, or architecture.

It's a sensitive operation that requires rigour and a sound strategy (scope, data to be migrated, switchover plan, tests) to avoid any regression and limit impact on users.

Migration in practice

Typical migration scenarios

Hosting change or move to the cloud.
Technological overhaul (PHP to Symfony, AngularJS to React).
CMS migration (WordPress to Astro, Drupal to Strapi).
Database switch (MySQL to PostgreSQL, on-premise to managed).
Historical data transfer between two ERPs or CRMs.

Methodology

Map the existing - scope, dependencies, volumes.
Define the minimum scope to be taken over (often narrower than expected).
Switchover plan - big bang or progressive depending on the risk.
Test in a mirror environment before the actual switchover.
Rollback plan mandatory.

Caveats

Data - quality, integrity, GDPR during data migration.
SEO if website redesign - maintain 301 redirections.
Client / user communication beforehand, not on D-day.

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