implementing-immutable-backup-with-restic

name	implementing-immutable-backup-with-restic
description	Use when implementing immutable backup strategy using restic with S3-compatible storage and object lock for ransomware-resistant data protection. Automates backup creation, integrity verification via restic check --read-data, snapshot retention policy enforcement, and restore testing. Integrates with AWS S3 Object Lock, MinIO, and Backblaze B2 for WORM (Write Once Read Many) storage that prevents backup deletion or encryption by ransomware actors.
domain	cybersecurity
tags	["restic","backup","immutable","ransomware","s3","object-lock","worm","recovery"]
subdomain	ransomware-defense
version	1.0.0
author	oyi77
license	Apache-2.0
nist_ai_rmf	["MEASURE-2.7","MAP-5.1","MANAGE-2.4"]
atlas_techniques	["AML.T0070","AML.T0066","AML.T0082"]
nist_csf	["PR.DS-11","RS.MA-01","RC.RP-01","PR.IR-01"]

Implementing Immutable Backup With Restic

Overview

Cybersecurity skill for implementing immutable backup with restic. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "implementing immutable backup with restic"

• "Implements immutable backup strategy using restic with S3-compatible storage and"

• Establishing ransomware-resistant backup infrastructure with cryptographic integrity verification

• Implementing 3-2-1-1-0 backup strategy where the extra 1 is an immutable copy

• Automating backup verification workflows that test restore capability on a schedule

• Protecting backup repositories from deletion or modification by compromised admin accounts

• Meeting compliance requirements for data retention with tamper-proof storage

Do not use as the sole backup solution without also maintaining offline/air-gapped copies. Object lock protects against logical deletion but not physical storage failure.

When NOT to Use

• When you lack proper authorization for testing
• For production systems without change management
• When the task requires legal or compliance expertise beyond technical scope

Prerequisites

• restic binary installed (https://restic.readthedocs.io/)
• S3-compatible storage with Object Lock enabled (AWS S3, MinIO, Backblaze B2)
• Python 3.8+ with subprocess module
• AWS CLI or MinIO client (mc) configured for bucket access
• Sufficient storage for backup repository (typically 2-3x source data with deduplication)

Workflow

# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": r"\b[a-f0-9]{64}\b",
}

def extract_iocs(text: str) -> :
     {k: re.findall(v, text)  k, v  IOC_PATTERNS.items()}