Cloud migrations rarely fail because the target platform was a poor choice. They fail because everything moved at once, on a weekend, with a rollback plan that existed only as a paragraph in a document.

The alternative is unglamorous: move the least risky components first, run both environments in parallel long enough to trust the new one, and treat the database as the last and most rehearsed step.

It takes longer on paper. It takes considerably less time than an emergency restore on a Monday morning.

Start with stateless services. Anything that holds no data of its own can run in the new environment while the old one is still live, and can be switched back instantly if it misbehaves.

Move static assets and background jobs next. Both are low-risk, both give you real operational experience with the new platform, and neither affects a customer if you need to reverse them.

Databases last, with replication running long enough that the new instance is provably in sync before any traffic depends on it. This is the step to rehearse more than once, on real data volumes rather than a sample.