IT Consulting

Cloud migration without the downtime: a practical checklist

What we walk through before touching a single server, so growing businesses don't lose a day of uptime.

6 min read·Trazilo Team

Most of the anxiety around cloud migration isn't really about the cloud — it's about downtime. A business that can't afford to go dark for even a few hours understandably treats migration as a risk rather than an upgrade. Done correctly, it doesn't have to be either.

Before migration day

We map every system that depends on the current infrastructure — not just the obvious ones like the website or the database, but the quieter dependencies: scheduled jobs, third-party integrations, email routing, backup scripts. Missing one of these is what usually causes an unplanned outage, not the migration itself.

Run parallel, don't switch cold

We stand up the new environment alongside the old one and mirror data between them before any traffic moves. This means the cutover is a DNS change, not a rebuild under pressure — and it means we can roll back instantly if something looks wrong.

Test failure, not just success

A migration plan that's only been tested for the happy path isn't tested. We deliberately simulate a failed deployment, a dropped connection, and a rollback before the real cutover, so the team isn't improvising if something goes wrong on the day.

Move in off-peak windows, in stages

Rather than migrating everything at once, we move lower-risk systems first — static assets, staging environments — and save the systems your customers touch directly for a scheduled low-traffic window, with the team watching in real time.

After the move

Migration isn't complete when the new servers are live — it's complete when monitoring, backups, and alerting are fully working in the new environment too. We treat that as part of the same project, not a follow-up task that quietly gets deprioritised.

The businesses that experience real downtime during a migration are almost always the ones that skipped one of these steps to save time. It rarely does — it just moves the risk to migration day itself.

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