What is immutable storage and why should organizations use it?

Understanding and using immutable storage

Immutable storage prevents changes or deletions for a defined retention period. Once data is written and locked, it cannot be altered, which is essential for preserving evidence and meeting regulatory obligations.

Benefits of immutability:

• Prevents tampering from insiders or malware (including ransomware).
• Ensures defensible retention for legal holds and audits.
• Simplifies compliance by enforcing write-once retention policies.

Implement immutability with object locks, write-once media, or specialized retention controls offered by cloud providers. Combine immutability with encryption, strict access controls, and monitoring to create a strong preservation posture. Immutable storage is particularly important for financial records, legal documents, and other high-risk data that must remain unchanged.