THE 3-2-1-1-0 RULE
Three copies, two media, one offsite, one immutable, zero errors.
The 3-2-1-1-0 rule is the modern evolution of the 3-2-1 guideline recommended by cybersecurity agencies: 7dBackup implements every digit automatically, and European law increasingly expects nothing less.
3
Copies of your data
2
Different storage media
1
Copy offsite, in the EU
1-0
Immutable, zero errors
DIGIT BY DIGIT
What each number means, and who provides it
The rule splits responsibility between you and your backup platform: 7dBackup automates every step, so no digit depends on manual discipline.
3
Three copies of your data
Production data plus at least two backups. Every 7dBackup job creates an independent, encrypted restore point in the storage vault.
2
Two different media
Copies must not share a single failure domain: local disk or NAS on one side, 7dBackup cloud vaults on the other.
1
One copy offsite
An encrypted copy leaves your building: 7dBackup stores it in ISO 27001 certified, Tier III data centers in the European Union.
1
One immutable copy
The modern answer to air-gapping: Object Lock (WORM) copies cannot be modified or deleted, even with valid credentials.
0
Zero restore errors
A backup only counts if it restores: verified test restores and job logs prove recoverability before you need it.
7D
Automated end to end
Schedules, replication, immutability and retention run from one console: the rule holds every day without manual effort.
RULE MEETS REGULATION
Why European law effectively requires it
No EU text names 3-2-1-1-0, but its requirements map onto the rule almost one-to-one: implementing the rule produces the evidence the articles ask for.
- Restorable copies of personal data, GDPR Art. 32(1)(c)
- Backup management and disaster recovery, NIS2 Art. 21(2)(c)
- Backup scope and frequency by data criticality, DORA Art. 12(1)
- Segregated systems for restoration, DORA Art. 12(3)
- Regularly tested restores, zero-error evidence, GDPR Art. 32(1)(d)
HA
Active-active replicated console
WORM
Anti-ransomware immutable storage
O
Hardware required on client side
Continuity of the backup-restore cycle
EVERY DIGIT, COVERED
How 7dBackup delivers the rule
Each element of 3-2-1-1-0 maps to a platform capability that is active by default, not an optional extra.
- 3 copies, automated
- 2 media: local + cloud
- 1 offsite in EU data centers
- 1 immutable (Object Lock)
- 0 errors: verified restores
- Client-side AES-256
- Cross-site replication
- Audit-ready job logs