Caelum,
file storage that knows
where your data lives
Software-defined NAS that offloads your cold files to S3 on its own, with native HA and migration tooling for your existing SMB shares. Ships as an OVA, runs from a web UI.
5-minute deploy · Runs on VMware / Proxmox / KVM · Built 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
HA orchestrator with quorum + fencing. 5–7s failover RTO validated in production. 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.
Coming: in-pool tiering between fast disks (NVMe / SSD) and capacity HDDs for the hottest workloads.
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.
Built-in AI assistant
Claude BYOK. Ask questions about storage, NFS, SMB, S3. Agent mode that can self-heal.
Three steps, about 30 minutes of setup
Deploy the OVA
On VMware, Proxmox or KVM. 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 | ✓ OVA for VMware/Proxmox/KVM | ≈ Heavier setup | ✗ Synology hardware only | ≈ ONTAP Select is complex |
| Built-in anti-ransomware | ✓ Veto + S3 immutability | ≈ Third-party plugin | ≈ Separate ActiveProtect | ≈ FPolicy + extra license |
| Per-TB pricing | ✓ None | ✓ None | ≈ Hardware lock-in | ✗ $/TB |
Free 1 TB forever. Or €90/month, everything unlimited.
No per-TB license. Free for homelab and small business, Trial to evaluate at full scale, Production for prod.
Free
Up to 1 TB, forever
- ✓ 1 TB usable cap
- ✓ 1 node (no HA)
- ✓ S3 tiering, snapshots, migration
- ✓ Online docs (no committed support)
Trial
30 days, unlimited capacity
- ✓ All features (HA included)
- ✓ Unlimited capacity
- ✓ POC, sizing, benchmark
- ✓ One-click conversion to Production
Production
Unlimited, support included
- ✓ Unlimited capacity
- ✓ 2-node HA cluster
- ✓ Email support, business hours
- ✓ Migration assistance included
Done paying for primary storage that nobody reads?
Book a 20-minute live demo. We'll walk through your exact use case — no sales deck.