What is immutable storage?

In object-oriented and functional programming, an immutable object is any object whose state cannot be modified after it is created. Similarly, immutable storage cannot be edited, deleted or rewritten once it is created and saved until a predetermined retention period ends.

Immutable storage is used to preserve records and maintain data integrity, based on the principle of write-once-read-many (WORM) data security. These types of file systems allow stored data to be accessed repeatedly once created, but not modified.

Considering the increasing necessity for critical data integrity, secure data storage and reliable data backups, immutable storage presents numerous valuable advantages versus other types of file systems.

As cyberattacks become more sophisticated, traditional backup storage solutions are often insufficient. Ransomware attacks are increasingly targeting stored data directly with malware that can encrypt and lock users out of important systems (or even delete essential files entirely). Immutable backups provide a robust defense against these types of attacks by ensuring that a pristine backup is always available, thus preventing irreplaceable data loss.

Immutable storage and backup prevent data loss from various types of threats. These threats include accidental deletion to other insider threats like intentional data destruction or tampering. Even users who may have the required permissions cannot alter protected information. Whether accidental, intentional but incorrect, or specifically malicious, data that is stored as an immutable object cannot and will not be affected.

In industries like finance or healthcare that demand strict data retention policies, immutable storage ensures that data remains untouched for the mandated period, simplifying compliance adherence.

These are some key features and aspects that distinguish immutable storage from other kinds of storage.

Besides, simply storing and preserving data, immutable storage can also provide strong authentication and granular permissions protocols, enabling easy access for approved persons, while effectively blocking out any unauthorized users.

Immutable storage replication enables the easy creation of multiple copies. Should any issue arise, these redundancies ensure seamless business continuity and bolster data security.

Unlike traditional file systems, object storage dynamics use a flat structure that organizes discrete units of data into objects that can be stored and retrieved more efficiently. In this way, object storage removes the complexity and scalability challenges of hierarchical file systems, improving performance and scalability.

Although it is possible to create immutable storage for an indefinite period of time, most data does not need to be preserved or retained forever. Immutable storage is easily customized to suit any context, allowing for flexible short- or long-term retention periods.

From ransomware protection to cloud storage backups, immutable storage presents many valuable use cases.

• Data protection: Immutable storage can provide tremendous peace of mind for companies and organizations that rely on the integrity of their data. Businesses operating in high-stakes industries—such as the law, medicine, banking, security and more—rely on immutable data storage to protect data from tampering by both outside and inside sources.
• Backup data security: Data backups are obviously crucial for maintaining business continuity through natural disasters, cyberattacks or any sort of system failure. Immutable backups aid in disaster recovery by creating irrefutable redundancies that can be insulated from major threats. Cloud service providers readily offer immutable data storage options housed in off-site data centers that can be easily scaled-up to service global enterprises.
• Compliance: Immutable cloud backup also aids in regulatory compliance by maintaining a backup copy of vital data, providing easily accessible backups in the event of any issue affecting the main file architecture. By keeping these backups in immutable storage, businesses under rigorous compliance requirements can ensure that their operations continuously satisfy data retention policies.

For organizations that must maintain data integrity, business continuity and sensitive internal records, the benefits of immutable security typically outweigh any drawbacks. However, since immutable storage cannot be deleted or altered before its predetermined date, large amounts of immutable data can become costly or difficult to store.

Cloud-based immutable storage can be easily expanded depending on their providers’ pricing plans. However, whether immutable objects are stored on-premises or in the cloud, all immutable data is still susceptible to physical damage, such as fire or flooding. For this reason, cloud-based storage options are favored for their ability to replicate immutable backups across different data center locations.