In the age of rampant ransomware, data backup is no longer simply a matter of copying files at the end of the day. Faced with a major disaster, whether it's a destructive cyberattack, a critical hardware failure, or an environmental incident (fire, flood), an organization's survival depends directly on its resilience strategy.

To design a modern and efficient architecture, it is essential to combine two fundamental concepts: connected backups (online / "Hot backups") and disconnected backups (offline / "Cold or Air-gapped backups"), whether deployed in the Cloud or locally.

Connected Backups ("Hot Backups"): The Agility of Restoration

A connected backup is a system that is continuously or frequently connected to the company network. Data is transferred to it automatically in real time or at very regular intervals.

RTO (Recovery Time Objective): In the event of accidental deletion or server crash, restoration can be initiated in a few clicks, reducing downtime to the bare minimum.

RPO (Recovery Point Objective): Thanks to continuous synchronization, the maximum permissible data loss approaches zero. The company loses only a few minutes of data entry.

Cloud vs. On-Premise Deployment: In cloud mode, data is automatically outsourced to highly secure data centers, guaranteeing complete immunity against local physical disasters. In on-premises mode (NAS/SAN), transfer speeds remain blazing fast, allowing for the instant restoration of massive volumes without relying on internet bandwidth.

Cold/Air-Gapped Backups: The Ultimate Defense

An offline backup relies on the principle of air gap (physical or logical isolation). The backup medium has no physical, electrical, or active network connection to the production infrastructure.

Absolute immunity against ransomware : Even if a hacker gains administrator privileges on your network, they cannot encrypt or corrupt anything that is not connected. Offline backups remain safe and usable.

Protection against internal sabotage : In the event of malicious action by a disgruntled employee, the disconnected support preserves the company's history.

Cloud vs. On-premises deployment: On-premises deployments use LTO tapes or removable disks stored in a fireproof vault or off-site. Cloud deployments rely on data immutability (Object Locking/WORM): backup files cannot be modified or deleted for a defined period, protecting data against any attempt at destruction.

The Universal Golden Rule: The Evolution of 3-2-1 (The 3-2-1-1-0)

To ensure maximum resilience, cybersecurity experts recommend applying this strict methodology:

3 copies of your data in total (1 production + 2 backups).

2 different media for local backups (e.g., internal computer disk and a dedicated NAS).

1 off-site copy (e.g., in the Cloud).

1 disconnected or immutable copy (Air-Gapped or Cloud WORM).

Zero errors tolerated thanks to the implementation of regular restore tests.

Hybridization as the only viable strategy

Pitting connected versus disconnected backups, or Cloud versus Local, against each other is a misjudgment. A resilient company doesn't choose between speed and security: it combines both.

Connected backups provide operational convenience by enabling the instant repair of minor incidents. Conversely, disconnected or immutable backups constitute the lifeline of the organization—the absolute certainty of being able to rebuild the infrastructure from a clean slate after a devastating cyberattack or total disaster.

If you need more information or simply an effective and reliable partner, feel free to make an appointment.