Migrating Servers to the Cloud: A Guide to Moving from Physical to Cloud Servers

In most organizations, the decision to start migrating servers to the cloud comes up when hardware reaches the end of vendor support, rack and energy costs rise, or capacity needs change quickly. A well-planned cloud migration moves workloads onto infrastructure that is more flexible and easier to back up and monitor. Done without a plan, it leads to application outages, performance problems and unexpected costs.

This guide explains in plain terms the steps involved in moving from physical or on-premises virtual servers to cloud servers. Businesses expect three things: all data moved intact, downtime kept within the planned window, and the ability to roll back if something goes wrong. The article covers method selection, inventory, data transfer, testing and cutover day under separate headings.

What does migrating servers to the cloud mean, and when is it needed?

Migrating servers to the cloud means moving servers that run on-premises or in a rack, together with their operating systems, applications and data, onto cloud infrastructure. NIST’s SP 800-145 definition of cloud computing describes the cloud as a model that enables on-demand network access to a shared pool of configurable resources with minimal management effort. A cloud server sits in the infrastructure-as-a-service (IaaS) layer of this model.

Cloud migration is not equally urgent for every workload. Organizations typically make the decision in the following situations:

• Hardware end of life: Consuming capacity as a service instead of investing in a hardware refresh.
• Variable capacity needs: Scaling CPU, RAM and disk quickly during seasonal load peaks.
• Gaps in backup and disaster recovery: Reducing the risk of servers sitting in a single location.
• Operational burden: Taking hardware failures, power and cooling off the internal team’s plate.
• Scattered infrastructure: Consolidating servers in different branch offices into a single manageable environment.

Moving from physical servers to cloud servers: which methods are there?

Not every application is migrated the same way. The method depends on the application’s age, its licensing and how ready the organization is for change. The approaches commonly used in the industry fall into three main categories.

Rehost (lift-and-shift): The server is moved to the cloud as a virtual machine, along with its operating system and application, without changes. It is the fastest method and the most common path when moving from physical servers to cloud servers. Replatform: The application stays the same, but the operating system version, database or storage layer is updated. Refactor: The application is redesigned to take full advantage of cloud capabilities; this method delivers the most benefit and requires the most effort.

In practice, most organizations start with rehosting and then adapt selected applications once workloads have stabilized in the cloud. This sequence minimizes risk and downtime when migrating servers to the cloud.

Pre-migration inventory and dependency analysis

Much of a successful cloud migration is decided in the inventory work done before the move begins. Migrating without knowing which server runs which application, which database it connects to and which ports it communicates on leads to surprises on cutover night. At a minimum, the inventory should capture:

1. Server profile: Operating system and version, CPU, RAM, disk size and actual utilization.
2. Applications and services: Running software, license types and whether licenses are tied to hardware.
3. Dependencies: Database, Active Directory, file shares, email and external API connections.
4. Network layout: IP addresses, DNS records, firewall rules, VPN and branch connections.
5. Downtime tolerance: Acceptable downtime and data loss tolerance for each application.

Microsoft’s Cloud Adoption Framework migration planning guide also recommends migrating directly dependent components together and keeping components in the same group when you are unsure how critical a dependency is. This approach applies to any cloud migration project, regardless of vendor.

Server migration plan: moving to the cloud in 7 steps

Once the inventory is complete, the server migration plan is written down. The plan should include the sequence, timeline, owners and rollback conditions. The generally accepted flow in enterprise projects is:

1. Target architecture: Define cloud server sizes, network segments, firewall rules and backup policy.
2. Wave plan: Group servers by dependency; low-risk and test environments go in the first wave.
3. Initial data copy: Transfer data to the target environment while production keeps running, and sync changes through replication.
4. Testing: Bring the application up in an isolated network in the cloud and run functional, performance and integration tests.
5. Cutover window: Transfer the final delta, stop the source server and update DNS and IP routing.
6. Validation: Run user acceptance testing and confirm that monitoring and backup jobs are working.
7. Decommissioning the source: After the agreed observation period, retire the old server securely.

Each step should end with a “go / no-go” checkpoint. The most expensive mistake in server-to-cloud migration projects is skipping the test phase and going straight into the cutover window.

With or without downtime? Data transfer methods

How data is transferred affects downtime as much as the migration method does. Non-critical systems can be moved in a planned maintenance window, while customer-facing applications are usually migrated with near-zero downtime using continuous replication.

To estimate transfer time, data size and connection capacity are calculated together. For large data volumes, starting the initial copy days in advance means only the latest changes need to be transferred on cutover night. Sending traffic through an encrypted tunnel and running integrity checks between source and target should also be part of the plan.

The method is decided for each server individually, based on the downtime tolerance identified in the inventory. Veeam-based replication is one of the common methods for continuously syncing virtual and physical workloads to the target environment.

Common practice and the right approach

In many organizations, common practice is to copy the physical server’s resource specs one-to-one and create a virtual machine of the same size in the cloud. Yet on-premises servers are often purchased with far more resources than they actually need. The right approach is to size based on real utilization data and scale resources up as demand grows.

The same logic applies after migrating servers to the cloud. The project does not end when the move is done; resources are readjusted using performance and cost data from the first few weeks, and backup and monitoring policies are updated for the cloud environment. Where common practice leaves backups “for later,” the right approach has them in place from day one. Sizing options for migrated workloads are available on the cloud server rental page.

Hosting in Türkiye, KVKK and data residency

For businesses operating in Türkiye, where data will reside is not a technical detail in a cloud migration decision; it is a compliance issue. KVKK (Türkiye’s Personal Data Protection Law, Law No. 6698) makes transfers of personal data abroad subject to specific conditions. When you choose cloud infrastructure hosted in Türkiye, most obligations arising from cross-border transfers do not come into play.

MAV Cloud’s infrastructure runs in the Equinix data center in Istanbul, on a VMware virtualization layer. This also makes it easier for organizations using VMware on-premises to move their virtual machines to a familiar platform. The information in this section is general in nature and does not constitute legal advice; for an assessment specific to your organization, work with your legal counsel.

Common mistakes and the right approach

Most problems in cloud migration projects stem from incomplete preparation, not from the technology. These are the mistakes we see most often in the field, and how to avoid them:

• Overlooking dependencies: The application is migrated, but the license server or shared folder it relies on is forgotten. The right approach is a dependency map before migration.
• Not writing a rollback plan: When problems arise, it is unclear how to return to the source. Rollback conditions and steps should be written and tested in advance.
• Not calculating bandwidth: A cutover date is set without estimating how long terabytes of data will take to transfer. Take the initial copy in advance and transfer only the delta during cutover.
• Not lowering DNS TTL values: Record changes take hours to propagate. Lower the TTL before cutover.
• Not checking licenses: Hardware-bound licenses may not work in the new environment. Verify vendor terms before migration.
• Postponing post-migration security: Firewall rules, backup and monitoring should be active from day one.

Another common mistake is not comparing performance after the migration. If application response times and resource usage are measured before cutover, any differences in the cloud can be assessed with hard data, and resource tuning is based on measurement rather than guesswork.

The common fix for all of these mistakes is to manage migrating servers to the cloud as a planned project, not a one-off copy job.

Standards to look for in a reliable cloud migration

Running the migration with a service provider keeps your internal team from having to carry the project on top of day-to-day operations. When choosing a provider, however, evaluate process, certifications and support model as well as infrastructure.

MAV Cloud holds ISO/IEC 27001, ISO/IEC 27701, ISO 22301, ISO 9001 and ISO/IEC 20000 certifications. Its infrastructure is built in an Equinix data center in Türkiye on VMware and Veeam technologies. The SLA defines a 99.9% monthly availability target for cloud servers, and 24/7 expert support is provided.

When evaluating a proposal, these questions help: Who performs the inventory and dependency analysis? Is a test environment provided? Who is on call during the cutover window? Are rollback conditions documented? The step-by-step migration process is described in detail on the cloud migration services page.

Frequently Asked Questions

How long does it take to migrate servers to the cloud?

It depends on the number of servers, data size, connection capacity and application dependencies. Once the inventory and testing phases are planned, continuous replication keeps the actual cutover window short.

Is there downtime during a cloud migration?

When critical applications are migrated with continuous replication, downtime is limited to a short window in which the final delta is transferred and routing is switched. Non-critical systems can be migrated in a planned maintenance window.

Can data be lost when moving from a physical server to a cloud server?

In a well-planned migration, a full backup is taken beforehand, data is synced through replication and validation is performed after cutover. The source server is not shut down until the observation period ends.

What is lift-and-shift?

Lift-and-shift (rehost) means moving a server to the cloud as a virtual machine, together with its operating system and application, without changes. It is the fastest and lowest-risk cloud migration method.

What should a server migration plan include?

The plan should include the server inventory, dependency groups, migration sequence, data transfer method, test steps, cutover window, owners and rollback conditions.

Can existing licenses be used in the cloud?

License terms vary by vendor and license type. Some licenses are tied to hardware and require reactivation in the new environment; vendor terms should be checked before migration.

Does the data stay in Türkiye?

MAV Cloud infrastructure is located in the Equinix data center in Istanbul; migrated servers and data are hosted in Türkiye. This simplifies cross-border transfer assessments under KVKK.

Who manages the servers after migration?

If the organization prefers, it can continue managing them with its own team; alternatively, operating system, backup and monitoring tasks can be handed over to the provider as a managed service.

For IT managers just starting to research the topic, the first step is to draw up a simple list of your current servers and the applications running on them. Organizations that cannot yet decide on a method can start with a small pilot migration of test and development servers. Teams ready to act can use a free initial assessment to define the scope and sequence of their project for migrating servers to the cloud.