Backup Strategy in a Homelab: Protecting Data Beyond RAID

This post covers how backups are implemented in my homelab, focusing on protecting data beyond RAID and ensuring recoverability.

While RAID provides redundancy, it does not protect against data corruption, accidental deletion, or system failure. A separate backup strategy is required to ensure data can be restored when needed.

Why Backups Matter

Backups protect against:

• Accidental file deletion
• Data corruption
• Disk failure beyond RAID tolerance
• System misconfiguration or failure

Without backups, data loss is often permanent.

Backup Strategy Overview

The backup approach is based on:

• Separating primary storage and backup storage
• Keeping backups independent from the main system
• Ensuring data can be restored reliably

This avoids relying on a single system for both storage and backup.

What Gets Backed Up

Critical data includes:

• Application data (Ghost, Pi-hole, etc.)
• Configuration files
• Docker volumes
• Important system data

Non-critical data (e.g. media) is not prioritised for backup.

Backup Flow

Data flows as follows:

Primary Storage → Backup Location

Backups are performed regularly to ensure recent data is available for recovery.

Backup Methods

Backups are performed using:

• File-level copying for important directories
• Periodic sync jobs to a separate storage location

This keeps the process simple and transparent.

Restore Process

Backups are only useful if they can be restored.

The restore process involves:

• Identifying the correct backup version
• Restoring files to the appropriate location
• Restarting services if required

Testing restores is critical to ensure backups are valid.

Issues Encountered

Some challenges included:

• Ensuring backups were consistent during active use
• Avoiding overwriting good data with corrupted data
• Verifying that backups were complete

These highlighted the importance of validation and testing.

Key Learnings

• RAID is not a backup
• Backups must be independent of the primary system
• Restore capability is as important as backup creation
• Simplicity improves reliability

What’s Next

The next step is exploring security and access control, including how services and data are protected within the environment.