What is data security and how does it work?

Quick definition Data security is the practice of protecting digital information from unauthorized access, corruption or theft across its entire lifecycle, from creation and storage to transmission and disposal. It combines technical safeguards such as encryption, administrative safeguards such as policy and training, and physical safeguards such as facility access control.

Key takeawaysData security protects the information itself. Cybersecurity protects the broader systems and networks that store and move it.The global average cost of a data breach was 4.44 million US dollars in 2025, according to IBM, while human error and IT failure together caused nearly half of all breaches studied.Sixty percent of breaches in 2025 involved a human element, and credential abuse remained the top initial access vector, per Verizon's 2025 Data Breach Investigations Report.Data security controls generally fall into three categories: technical, administrative and physical.A documented framework such as NIST Cybersecurity Framework 2.0 helps structure a data security program around six functions: govern, identify, protect, detect, respond and recover.

Data security is the set of practices, tools and policies organizations use to protect digital information from unauthorized access, corruption, theft or loss, whether that data sits on a device, moves across a network or lives in the cloud. It covers everything from encrypting a hard drive to training employees to recognize a phishing email.

Data does not secure itself. Every organization holds information, financial records, personal details, intellectual property, that becomes a target the moment it has value to someone else. Data security exists to close that gap: even if an attacker reaches a system, properly secured data should stay unreadable and unusable to them.

Because breaches keep getting more frequent. The Identity Theft Resource Center tracked 3,322 publicly reported data compromises in the United States in 2025, a record in the twenty-year history of its Annual Data Breach Report and a five percent increase over 2024.

The financial impact is significant too. IBM's Cost of a Data Breach Report 2025 puts the global average cost of a breach at 4.44 million US dollars, and the US average at a record 10.22 million US dollars. Health care remained the most expensive sector to recover in, at an average of 7.42 million US dollars per breach, for the fourteenth year running.

Much of that risk still traces back to people rather than exotic malware. IBM found malicious attacks caused 51 percent of breaches studied, while human error accounted for 26 percent and IT failure for 23 percent. Phishing overtook stolen credentials in 2025 as the single most common way attackers get in, responsible for 16 percent of breaches.

Data security controls generally fall into three recognized categories, the same framework used in security standards such as the HIPAA Security Rule.

1. Technical controls. The tools that act directly on data and systems: encryption, access control, authentication, firewalls, intrusion detection and anti-malware software. Encryption is the backbone of technical control. Even if data is copied or intercepted, a strong algorithm such as AES-256 renders it unreadable without the key.
2. Administrative controls. The policies and processes that govern how people handle data: access permissions, data classification, incident response plans and employee training. Because most breaches involve some human element, administrative controls often determine whether an incident is contained quickly or escalates.
3. Physical controls. The safeguards protecting the hardware and facilities where data lives: locked server rooms, biometric access, surveillance and environmental protections such as backup power and fire suppression in data centers.

No single category is enough on its own. A data center can have world-class physical security and still be breached through a phished employee credential, which is why data security programs combine all three.

Four categories of risk account for most of the incidents organizations face.

1. Accidental exposure. Human error, an unintentional share, a misconfigured cloud bucket, a lost device, remains one of the most common root causes of exposure. IBM attributes 26 percent of studied breaches to human error alone.
2. Phishing and social engineering. Attackers manipulate people into handing over credentials or access rather than breaking through technical defenses. Phishing was the top initial access vector in IBM's 2025 research, and Verizon's 2025 Data Breach Investigations Report found credential abuse, often fed by phishing, involved in 22 percent of breaches and in 88 percent of basic web application attacks.
3. Insider threats. Employees, contractors or partners with legitimate access can misuse it, intentionally or not. Privileged access management and the principle of least privilege limit how much damage a single compromised or careless account can do.
4. Ransomware. Attackers encrypt or steal data and demand payment for its return. Verizon found ransomware present in 44 percent of breaches analyzed in 2025, up from 32 percent the year before, though the median ransom payment fell to 115,000 US dollars and 64 percent of victim organizations refused to pay. For a deeper look at how specific ransomware families and infostealers operate, see the Acronis Global Cyber Threat Catalog.

No. Data security focuses specifically on protecting the information itself, through encryption, access control and classification, so that even compromised data stays unusable to an attacker. Cybersecurity is the broader discipline of protecting the systems, networks and devices that store, process and move that data, defending against malware, network intrusion and other attacks on the infrastructure around it.

Cybersecurity protects the building. Data security protects what is inside the safe. An organization needs both: a well-defended network holding unencrypted, unclassified data is still one stolen laptop away from a breach, and tightly encrypted data on an unpatched, unmonitored network is still exposed to attackers who never need to touch the data directly.

A workable data security program combines the following practices.

1. Access control and authorization. Apply the principle of least privilege so employees only reach the data their role requires, and use multifactor authentication so a stolen password alone is not enough to get in.
2. Data classification and encryption. Identify which data is sensitive, personally identifiable information in particular, and encrypt it both at rest and in transit so a breach does not automatically mean a readable data leak.
3. Cloud and device security. Cloud providers secure their own infrastructure, but organizations remain responsible for configuring access correctly and protecting the mobile devices and laptops that connect to it.
4. Physical access and audits. Restrict physical access to servers and storage, and run regular security audits to catch misconfigurations before an attacker does.
5. Employee training. Since human error and social engineering drive a large share of breaches, ongoing, practical training on recognizing phishing and handling data correctly is one of the highest-return investments available.
6. Regulatory compliance. Frameworks such as GDPR and CCPA set minimum requirements for how personal data must be protected and reported on. Compliance is a floor, not a ceiling, but it forces the basic hygiene many breaches expose as missing.
7. Data lifecycle management. Data that no longer serves a purpose is pure risk. Retention policies and secure deletion reduce how much sensitive information an attacker could ever reach.

Many organizations structure these steps around a formal framework. NIST Cybersecurity Framework 2.0, released in February 2024, organizes a security program around six functions: govern, identify, protect, detect, respond and recover, and works well as a checklist for finding gaps in an existing program.

Encryption converts readable data into ciphertext that only someone with the correct key can unlock. It is the technical control that most directly determines whether a breach becomes a disaster or a non-event.

Local backups should be encrypted so physical access to a device, a stolen laptop, a lost drive, does not equal access to the data on it. The Advanced Encryption Standard with a 256-bit key (AES-256) is the current industry benchmark: it is computationally impractical to break with existing technology, though organizations sometimes use shorter key lengths such as 128 or 192 bits for less sensitive data where performance matters more.

Data moving between a device and cloud storage needs the same protection in transit, typically through SSL or TLS encryption, so it cannot be intercepted in readable form partway through the journey. And because a recoverable encryption key is a key that can eventually be stolen, well-designed systems derive keys from a user's password without storing a retrievable copy, which is also why losing that password usually means losing access to the encrypted data permanently.

Acronis Cyber Protect integrates backup with cybersecurity in a single agent, so encryption, access control and recovery are managed from one place rather than stitched together from separate tools.

• Encrypted backup, locally and in the cloud. Backups are secured with the AES-256 algorithm, and users control their own password and encryption key rather than Acronis holding a recoverable copy.
• Secure, audited cloud storage. Acronis Cloud Storage runs in data centers designed to the Tier IV standard, with round-the-clock monitoring, biometric access controls and redundant power, and is independently examined under the SSAE 18 framework.
• A recovery path that reduces reliance on paying a ransom. Regular, isolated backups give organizations another way back online besides negotiating with an attacker, one of the most direct defenses against the 44 percent of 2025 breaches that involved ransomware.

For a full walkthrough of backup, disaster recovery and built-in anti-malware protection in one platform, see Acronis Cyber Platform (formerly Acronis Cyber Protect Cloud).

What is the simplest definition of data security? Data security is protecting information from unauthorized access, corruption or loss, so it stays confidential and usable only to the people who are supposed to see it.

What are the three main types of data security? Technical controls such as encryption and access management, administrative controls such as policy and training, and physical controls such as restricted facility access.

Is data security the same as cybersecurity? No. Data security protects the information itself. Cybersecurity protects the broader systems and networks that store and move that information. Most organizations need both.

What is the biggest cause of data breaches? According to IBM's 2025 research, malicious attacks caused 51 percent of breaches, while human error and IT failure together accounted for roughly half. Phishing was the single most common initial attack vector, at 16 percent.

How does encryption protect data if it is stolen? Properly encrypted data is unreadable without the correct key, so even if an attacker copies or intercepts it, the underlying information stays inaccessible.

Does backup count as a data security measure? Yes. Encrypted, regularly tested backups do not prevent an attack, but they reduce an organization's dependence on paying a ransom and give it a way to recover lost data.

• IBM, Cost of a Data Breach Report 2025
• Verizon, 2025 Data Breach Investigations Report
• Identity Theft Resource Center, 2025 Annual Data Breach Report
• National Institute of Standards and Technology, Cybersecurity Framework (CSF) 2.0, February 2024