3-2-1 Backup Strategy

The golden rule for data protection.

1. Keep 3 copies of your data (1 production + 2 backups).
2. Store them on 2 different media types (e.g., local NAS disk + tape/cloud).
3. Keep 1 copy off-site (Cloud, friend's house, remote office).

Practical Application

• Copy 1 (Production): Live data on server (NVMe).
• Copy 2 (Local): Daily backup on local NAS or local PBS (HDD).
• Copy 3 (Remote): Sync from NAS to Backblaze B2, AWS S3, or a remote PBS via VPN.

Data Flow

flowchart LR
    Prod[Production Data] -->|Backup| Local[Local Copy]
    Local -->|Sync| Remote[Remote Copy]
    style Prod fill:#f96,stroke:#333
    style Local fill:#9f6,stroke:#333
    style Remote fill:#69f,stroke:#333