Your NAS is full.
A new one costs a fortune.
Not Caelum.
Caelum first scans your existing shares — age, duplicates, reclaimable space, owners — then migrates them while preserving exact NTFS permissions: owner, ACLs, DENY entries. See what you move before you move it.
SMB migration with error recovery and checksums · NTFS ACL fidelity validated · Your data stays in France
Built by GaLiLo — observe, audit and move data.
Caelum constellation · α β γ δ Caeli
Caelum in 30 seconds
The problem, S3 tiering, HA and migration — at a glance
Three things other NAS boxes don't do
Built for IT leaders who want predictable storage, no NetApp expert required, and no HA compromise.
Transparent S3 overflow
80% of your files are never read again. Caelum offloads them to MinIO, AWS, Wasabi, Ceph or Backblaze — and recalls them on open as if they were local.
HA cluster, no per-node licensing
Active/passive HA orchestrator with quorum + fencing: on a node failure, the virtual IP, the pool and the shares fail over automatically to the second node. No per-node tax, no vendor-locked hardware.
Built-in assisted migration
SMB scanner + streaming incremental copy + cutover via DFS-N or DNS CNAME. Move off NetApp, Synology or Windows Server over a weekend, no third-party tool.
The product differentiator
Local and S3 — automatic
Caelum classifies your files by access age and archives the cold ones to S3 as local stubs. On open, transparent millisecond recall. Your users don't see the difference; your CFO sees the bill go down.
Active files stay on the local pool
While they're read regularly, your files stay on the local pool — on disks you pick (NVMe, SSD, HDD or a mix). Full bandwidth, sub-millisecond latency.
Per-share policy, not one-size-fits-all
Each share gets its own rule: "atime > 90 days", "size > 100 MB", "extension in (mov, vmdk, iso)". Fine-grained, never global.
Offloaded to S3, stub stays local
The physical file lands in S3 (AWS, Wasabi, MinIO, …). An empty stub stays on the pool with the original path and ACLs intact. Cost: €0.005–0.023 / GB / month depending on backend.
Millisecond recall on open
Caelum transparently intercepts the open(), pulls the file from S3 in parallel multi-part, restores it locally. 200–800 ms TTFB depending on backend. Unnoticeable on Office files.
Archive streaming
Your cold archives, openable at local speed
A multi-gigabyte file archived on S3 opens instantly. Caelum fetches only the bytes you actually read — as you read, without waiting for the full download, and without installing anything on your workstations.
Agentless
Nothing to install on workstations. Any SMB client — Windows, Mac, Linux — benefits.
Range reads
At the system level, not the whole file: you download what you read, not the rest.
Your S3, your sovereignty
MinIO or Ceph on-prem, or Wasabi — you pick the target, the data stays yours.
A UI built for ops
Everything is in the UI. Really.
No mandatory CLI for routine work. Real dashboard, real metrics, real built-in AI assistant. Actual screenshots from a production appliance.
Real-time dashboard
Cataloged files, volumes on S3, free capacity, top extensions — at a glance.
S3 targets
Plug in AWS, Wasabi, MinIO, Backblaze, Ceph — any S3-compatible endpoint.
Block-level replication
Targets and jobs between appliances. Failover on received datasets, RPO under control.
Catalog audit
Distribution by age, size, extension, owner. Understand your data before you tier it.
Assisted migration
Ingest an existing SMB share. Scan, incremental, cutover. No third-party tooling.
Sovereign AI assistant
Mistral hosted in France (GDPR, outside the US Cloud Act), included, no key to configure. Ask about storage, NFS, SMB, S3.
Three steps, about 30 minutes of setup
Install the ISO
A single universal ISO, on VMware, Proxmox, Hyper-V, KVM or bare-metal. Five-step web UI wizard. Up and running in about 5 minutes.
Migrate your data
Built-in SMB scanner + streaming incremental copy + DFS-N cutover. Nothing to buy on the side.
Turn on S3 tiering
Per-share policy (e.g. "inactive > 6 months → S3"). Save up to 70% on primary storage.
vs. TrueNAS · Synology · NetApp
Honest table. Where the others do better, we say so too — see the product page for details.
| Feature | Caelum | TrueNAS | Synology | NetApp |
|---|---|---|---|---|
| Transparent S3 overflow (recall) | ✓ Native, transparent recall | ✗ Backup-to-S3 only | ✗ Hyper Backup = backup | ≈ FabricPool (expensive, lock-in) |
| HA cluster | ✓ Included, no extra license | ≈ TrueNAS Enterprise $$$ | ≈ XS models only | ✓ Proprietary cluster |
| Built-in migration tooling | ✓ SMB scanner + cutover | ✗ Third-party tool | ✗ Third-party tool | ✗ Third-party tool |
| Multi-hypervisor deployment | ✓ Universal ISO (VMware/Proxmox/Hyper-V/KVM/bare-metal) | ≈ Heavier setup | ✗ Synology hardware only | ≈ ONTAP Select is complex |
| Built-in anti-ransomware | ✓ Veto + S3 immutability | ≈ Third-party plugin | ≈ Separate ActiveProtect | ≈ FPolicy + extra license |
| Built-in telemetry & dashboard | ✓ Native, real-time | ≈ Basic reporting | ≈ Limited DSM | ≈ Separate tools |
In early access.
Caelum is in early access. Access is free on request during this phase — a complete product (storage, S3 tiering, migration, replication & DR). Final pricing will be communicated later.
Free access on request
During the early access phase
- ✓ SMB/NFS storage, S3 tiering, migration
- ✓ Replication & DR, snapshots
- ✓ Performance dashboard + online docs
- ✓ Preferential terms for early adopters
A question? Email us at [email protected].
Done paying for primary storage that nobody reads?
Create your account, request access and download the ISO. Deploys in 5 minutes, no commitment.