To secure data in the cloud, control who can access it, limit what you store and expose, protect it with suitable encryption and key management, and prepare to detect incidents and restore from tested backups. Your provider secures parts of the service, but you remain responsible for your data, identities, access decisions, and many configuration choices.
Who is responsible for cloud security?
Cloud security is shared, but the division of work depends on the service. In general, infrastructure as a service (IaaS) gives you more control—and more responsibility—than platform as a service (PaaS). With software as a service (SaaS), the provider manages more of the underlying technology, but that does not make your data, users, or access settings the provider’s responsibility.
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| Service model | What the provider generally manages | What you still need to manage |
|---|---|---|
| IaaS | Physical facilities, hardware, and core cloud infrastructure | Your data, identities, permissions, configuration, and typically the operating systems and applications you deploy |
| PaaS | Infrastructure and more of the platform, such as managed runtime components | Your data, identities, permissions, application code, and service configuration |
| SaaS | The application and underlying service operations | Your data, users, permissions, sharing choices, and available security settings |
These are broad patterns, not a universal contract. Microsoft Learn’s Shared responsibility in the cloud matrix, for example, assigns customer data, configuration and settings, and identities and users to the customer across IaaS, PaaS, and SaaS. The exact boundary varies by provider and service; check the current responsibility matrix for each service you use.
How do I decide what needs protection?
Start with an inventory, not a security product. Identify where sensitive and business-critical information is stored, processed, shared, and backed up—including copies that may sit in collaboration tools, test environments, or exports. For each data type, set a classification and decide what protections it requires.
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- Access: Identify which people and workloads need the data, and limit access to those purposes.
- Sharing: Set rules for external sharing, links, and collaboration that match the data’s sensitivity.
- Retention: Keep information only as long as operational, legal, or contractual requirements justify it; plan how to dispose of it securely.
- Protection and oversight: Match encryption, monitoring, and review requirements to the data classification and applicable obligations.
Reducing the amount of sensitive information you keep can reduce exposure. Microsoft’s cloud security benchmark recommends minimizing the sensitive-data footprint and considering techniques such as hashing, truncation, or tokenization where appropriate. Those techniques need application-specific review: they do not replace access controls, and they may not suit every use.
How can I reduce account and access risk?
Stolen or misused credentials can give an attacker a direct route to cloud data. Protect the accounts that administer services and handle sensitive information first, then apply the same discipline across email, file storage, remote access, and cloud consoles.
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- Enable multifactor authentication (MFA). Prioritize administrators and users with access to sensitive data. Where the identity service and devices support it, consider phishing-resistant MFA such as a physical security key. CISA recommends physical security keys as a strong MFA option; check compatibility and provide a secure account-recovery method before relying on one.
- Apply least privilege. Give each person and workload only the permissions needed for its role. Avoid routine use of administrator accounts, remove access when responsibilities change, and review privileged access periodically.
- Track non-human credentials. Keep an inventory of API keys, service tokens, and similar credentials. Record an owner, scope, expiry or review date, and revocation procedure for each. Remove credentials that are no longer needed.
- Review the whole sign-in path. Consider user identity and device condition rather than treating access from a familiar network as automatically safe. CISA’s Trusted Internet Connections 3.0 Cloud Use Case (version 1.2, July 2025) discusses phishing-resistant MFA, device posture, and token lifecycle controls.
How should I protect cloud data and encryption keys?
Consider protection throughout the data lifecycle: while information moves between systems, while it is stored, and—if the workload and risk warrant it—while it is being processed. Check what encryption a service provides and whether it meets your contractual, regulatory, and risk requirements. A service’s encryption setting alone does not answer who can access the information or who controls the keys.
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Also include data retirement in the plan. Determine how information will be exported, retained or deleted when it is no longer needed, and handled if you stop using the service. Requirements can differ by service, contract, and jurisdiction, so confirm them before storing regulated or location-sensitive data.
How do I secure cloud configuration and network access?
Begin with the provider’s recommended secure baseline, then adapt it to the application and threat model. Defaults and appropriate settings differ among services; a control that is right for one workload may disrupt another. Document intentional exceptions and assign someone to review them.
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- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key NFC via USB-A and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
- Keep storage and administrative interfaces private unless public access is deliberately required and protected.
- Limit inbound and outbound network traffic to what the workload needs; separate sensitive workloads where practical.
- Review settings for unintended exposure and configuration drift, and address vulnerabilities in the systems and applications you manage.
- Use access decisions that account for identity and device context rather than trusting a request solely because it comes from a particular network location.
Google Cloud’s security guidance organizes controls across areas including infrastructure, identity, data, AI and machine learning, and security operations. That breadth is a reminder to assess the actual workload rather than assume that one setting or network boundary secures every part of it.
What should cloud logging, monitoring, and incident response cover?
Choose which activity and configuration events matter for your services, then decide how long to retain them and who will investigate alerts. Protect logs from alteration by unauthorized users, and confirm that you can obtain the records needed to understand an incident. Logging without an owner or response process may leave suspicious activity unnoticed.
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Assign incident roles and escalation paths before an event occurs. Establish how your team will contact the provider, how the provider will notify you, and what evidence each party can supply. Review the service’s audit and assurance resources as part of this planning; Microsoft Service Assurance’s Risk assessment guide for Microsoft Cloud recommends reviewing provider audit resources, some of which may require customer authentication.
How do I know cloud backups can actually be restored?
Set recovery objectives based on how much downtime and data loss your organization can tolerate. Keep backups that are protected from ordinary account compromise where feasible, and regularly test restoration. A completed backup job shows that a process ran; it does not prove that the right data can be recovered in the time you need.
Test a realistic recovery, including access to the backup and its encryption keys. Include data export, service termination, and portability in continuity planning so that recovery does not depend on an assumption that a service will always be available on the same terms. CISA’s cloud architecture guidance calls for regular backup testing and planning for data when a service ends.
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Before adopting a service or moving data, assess whether its controls and operating model fit your information, obligations, and ability to manage risk. A certification or assurance report can inform that assessment; it does not prove that your accounts, sharing settings, or workload configuration are secure.
- Responsibility: What does the provider manage, and which customer controls remain yours for this specific service?
- Security capabilities: Can you manage identities and keys, collect useful logs, configure access, and restore data as required?
- Assurance and operations: What audit materials, support, and incident communications are available, and who on your side will act on them?
- Compliance and location: Can the service meet your privacy, contractual, legal, and data-location requirements?
- Business fit: Do your integrations, staff skills, recovery needs, costs, and exit options make the service workable over time?
Revisit the assessment when the service, workload, obligations, or risk changes. Provider settings and responsibility boundaries can change too. Google Cloud’s Well-Architected Framework: Security, privacy, and compliance pillar was last reviewed February 5, 2025, and its security best-practices catalog was last updated October 5, 2026; use current service documentation when implementing controls.
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