When a sales team accesses its client file from a train, or when an accountant initiates a monthly close without turning on the office server, it is cloud computing that makes this possible. Behind this term lies a simple principle: using remote servers connected to the Internet to store data, run applications, and manage a company’s IT infrastructure.
Cloud governance and shared responsibility: the real issue before migrating
Most cloud guides detail the IaaS, PaaS, or SaaS models. Fewer explain what happens when an incident occurs. Who is responsible? You or the provider?
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Each cloud service provider applies a principle known as shared responsibility. Specifically, the provider secures the physical infrastructure (servers, network, power). The client company remains responsible for configuring its resources, managing user access, and classifying its data.
ANSSI recommends formalizing this division from the start. This involves a cloud-specific risk analysis, contractual clauses on reversibility (the ability to recover data if changing providers), and logging events to trace access and modifications. A detailed guide addresses cloud computing in business on Geekette and Greluche with a complementary practical angle.
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Without clear governance, the cloud becomes a risk rather than a lever. The most common mistake is migrating applications without inventorying sensitive data or defining who can access it.
Sovereign cloud and multi-cloud: two strategies reshaping choices in Europe
Have you noticed that some companies refuse to host their data with an American provider? This is not unfounded distrust. European regulations (GDPR, NIS2 directive, DORA regulation for the financial sector) impose strict requirements on data localization and control.
The sovereign cloud addresses this constraint. It ensures that data remains hosted on European territory, managed by entities subject to European law. The French “trusted cloud” doctrine pushes this logic further by requiring that the provider be independent of any extraterritorial legislation.
Why combine multiple cloud providers
The multi-cloud strategy involves distributing services among several providers. A company can store its financial data with a sovereign provider while using an hyperscaler’s solutions for its collaboration applications. According to NTT Data, European companies are accelerating the adoption of hybrid and sovereign cloud platforms to meet regulatory constraints.
This choice offers a tangible advantage: avoiding dependence on a single provider. If a provider raises its prices or changes its terms, the company retains some flexibility.
Reducing IT costs through the cloud: what really changes
The cloud transforms a capital expenditure (purchase of servers, maintenance, renewal) into a monthly operating expense. You pay for what you use, and you adjust up or down according to activity.
For an SME, this means no longer financing an oversized server “just in case.” For a seasonal business, it means increasing storage and computing capacity during peak activity, then reducing it for the rest of the year.
The main gain is not the unit price but the elasticity of expenditure. Several cost items disappear or decrease:
- The purchase and regular replacement of IT equipment (servers, storage arrays, uninterruptible power supplies), which tie up capital.
- Personnel costs dedicated to the physical maintenance of the infrastructure, including 24/7 monitoring and hardware updates.
- The energy consumption of an internal server room, which includes cooling, backup power, and floor space.
In return, the cloud generates new expense items: software licenses per user, bandwidth, and sometimes data egress fees charged when exporting data to another environment.
Cloud security best practices to protect company data
Security in the cloud does not solely rely on the provider. The majority of incidents stem from client-side configuration errors, not from vulnerabilities in the provider’s infrastructure.
Some practices to implement from deployment:
- Enable multi-factor authentication on all privileged accounts. A password alone no longer provides adequate protection.
- Classify data before migrating: public, internal, confidential, regulated. Each category calls for a different level of encryption and access control.
- Continuously monitor configurations. A storage bucket left publicly accessible by mistake is a data leak waiting to happen.
- Prepare a tested reversibility plan: know how to extract your data in a usable format, with a contractual timeline.
Logging and anomaly detection
CERT-FR emphasizes the need for centralized logging of access and events. This means maintaining a history of who accessed what, when, and from where. These logs allow for detecting abnormal behavior (login from an unusual country, massive file downloads) before it becomes an incident.
Cloud security governance also translates into a regular inventory of assets: how many virtual machines are running, which applications are deployed, which accounts are active. Without this inventory, the company pays for forgotten resources and exposes unnecessary attack surfaces.
Adopting cloud computing in business is not just about choosing between IaaS, PaaS, or SaaS. The real work begins after migration: governance of access, monitoring of configurations, contractual control of reversibility. Companies that get the most out of the cloud are those that treat their provider as a regulated partner, not as an invisible vendor.