Nimbus (by RDEM Systems) and Cyllene operate at two different stages of the Proxmox value chain. On one side, France's first Proxmox Training Partner, a 400+ employee IT group specializing in training, consulting, and integration. On the other, a PBS backup specialist with its own autonomous network (AS206014) and packaged offerings up to bank vault storage. This comparison helps you understand the complementarity between both approaches.
Last updated: March 2026
Nimbus (RDEM Systems): backup operational in 5 minutes
Where Cyllene excels at training and integration, NimbusBackup focuses on immediate backup deployment. No project phase, no quote, no prior audit: pick a plan, receive your credentials (80% of deliveries within 4 business hours), and add the PBS datastore in Proxmox VE. Your first backup runs within minutes.
This operational approach is built on sovereign infrastructure:RDEM Systems' autonomous network AS206014, self-hosted at the Equinix Paris datacenter — learn why RDEM Systems made this choice. Once trained by Cyllene, you're autonomous — and Nimbus gives you the tools to protect your production without depending on an integrator.
Nimbus is built for autonomous Proxmox admins: public pricing, fast delivery, zero project dependency. Pick your plan, connect, back up.
- Operational in 5 min: fast delivery, add PBS datastore, immediate backup
- 7 plans, no quote: from Single Drive at €6/month to Magnetic Bank at €149/TB
- Bank vault air gap: LTO tapes off-datacenter, 3-2-1-1-0 compliant
- 7-day free trial: test without commitment, without an integrator
Cyllene: Proxmox Training Partner and generalist IT group
Cyllene is a French IT group with over 39 years of history, 400+ employees, and 4 datacenters in France (including one in partnership with Data4). The group covers a broad spectrum: sovereign cloud, managed services, security, data, webmarketing, and training.
Cyllene's uniqueness in the Proxmox ecosystem is unmatched: Alexandre Derumier, architect at Cyllene, is one of the developers of the Proxmox VE open source project and the only certified trainer in France. Cyllene is the first Authorized Proxmox Training Partner in the country, offering official Qualiopi-certified courses (4-day Bundle Training, 2-day Deployment Training).
- 1st Proxmox Training Partner in France: official courses with a VE developer
- Enterprise certifications: HDS, ISO 27001, SOC 1/2 type II, PCI DSS
- 4 datacenters in France, operated 24/7, Tier 3+
- Full IT group: cloud, security, data, consulting, training, webmarketing
- Proxmox products: VE, Datacenter Manager, Backup Server, Mail Gateway
Note: Cyllene lists PBS among its Proxmox products, but does not publish public pricing for backup. Backup is part of a global managed services and consulting engagement, available on quote. No air gap or bank vault offering has been publicly identified.
Detailed comparison table
Two legitimate players positioned on different links of the Proxmox value chain: one trains and integrates, the other secures production data.
Training & consulting vs production & backup
Cyllene's strength in Proxmox training and integration is unmatched. Having a Proxmox VE developer as a trainer is a unique asset in France. Their official courses (4-day Bundle, 2-day Deployment) enable IT teams to master the platform before putting it into production.
But once the Proxmox infrastructure is deployed, the question of offsite backup arises. That's where Nimbus comes in: packaged PBS plans, immediately operational, on an independent network infrastructure (AS206014). No quote needed, no integration project — just add the PBS datastore in Proxmox VE and backup starts.
The natural path: Cyllene trains you on Proxmox and helps deploy your infrastructure. Nimbus secures your production data with an independent offsite backup.
Pricing: public grid vs project-based approach
Cyllene operates on a bespoke engagement model: each project gets a custom quote. This approach makes sense for complex integration projects (VMware migration — see our TCO VMware vs Proxmox analysis, private cloud deployment, DR/BCP) but is less suited for a Proxmox admin who simply wants to offsite their backups.
Nimbus pricing grid (public prices):
- Single Drive PBS: from €6 excl. tax/month (250 GB)
- Magnetic PBS (disk + LTO tape): €89/TB/month
- AirGapped LTO PBS (DC safe): €119/TB/month
- Magnetic Bank PBS (bank vault): €149/TB/month
For an SMB or admin who wants to estimate a backup budget in 30 seconds, Nimbus's public pricing offers immediate visibility. For enterprise accounts with complex integration needs, Cyllene's project-based approach may be more appropriate.
Backup independence: why separate the risks
Entrusting backup to the same provider as your Proxmox integration simplifies management, but creates a single point of failure. If the provider is compromised (ransomware, human error), the same incident can affect both your infrastructure and its backups.
Using Nimbus as an independent offsite backup — whether your infrastructure was integrated by Cyllene or another provider — guarantees physical and logical separation. A distinct AS (AS206014), a distinct datacenter (Equinix Paris), a distinct team.
Security rule: your backups should never depend on the same provider as your production infrastructure. A backup on a distinct AS is the best protection against full-compromise scenarios.
Nimbus goes further with bank vault air gap: LTO tapes are physically transported out of the datacenter. Cyllene has tape robotics in its datacenters, but no publicly identified off-site air gap offering.
Complementarity: train, deploy, secure
Rather than opposing them, Nimbus and Cyllene fit into a logical sequence:
- 1
Training (Cyllene)
Your teams learn Proxmox VE from the only certified trainer in France
- 2
Deployment (Cyllene or in-house)
The Proxmox infrastructure is deployed and put into production
- 3
Offsite backup (Nimbus)
Data is backed up on an independent AS, with optional bank vault air gap
Learn more about offsite Proxmox backup on sovereign infrastructure.
Who should choose what?
Choose Cyllene if:
- You need official Proxmox training for your teams
- You're migrating from VMware to Proxmox and need integration support
- HDS certification is required (healthcare sector)
- You need a single provider for your entire IT (cloud, security, data, training)
Choose Nimbus if:
- You want offsite PBS backup independent from your integrator
- You need physical air gap in a bank vault
- Transparent public pricing matters for your budget
- You're an SMB looking for plans starting at €6/month
- Network independence (distinct AS) matters for your resilience strategy
Frequently asked questions
Our verdict
Nimbus and Cyllene address distinct and complementary needs. Cyllene is the obvious choice for Proxmox training and integration — their Training Partner status and the presence of a VE developer are unique in France. Nimbus is the logical choice for offsite PBS backup with transparent pricing, packaged air gap plans, and network independence. The ideal path: train with Cyllene, back up with Nimbus.