Is Ceph or Kopia better?

Neither clearly leads. Ceph starts at Free and Kopia at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, Ceph or Kopia?

Ceph starts at Free and Kopia at Free.

Does Ceph or Kopia run on more platforms?

Ceph runs on Linux. Kopia runs on Linux, macOS, Windows, Docker.

Can I use Ceph for free?

Both have a free tier, so you can try either at no cost before committing.

What is Ceph best used for?

Ceph is most often used for backing a private cloud where virtual machine disks, shared filesystems and an s3 endpoint all need the same hardware, growing past the point where a proprietary array upgrade costs more than a rack of commodity servers, research and media environments with petabytes of data and staff who can operate storage, providing an s3 endpoint on premises with multi site replication under your own control. Of those, backing a private cloud where virtual machine disks, shared filesystems and an s3 endpoint all need the same hardware and growing past the point where a proprietary array upgrade costs more than a rack of commodity servers are not what Kopia is typically brought in for.

What can Ceph do that Kopia cannot?

Ceph covers RADOS object store, RADOS Gateway, RBD block devices, CephFS. Kopia covers Content defined chunking, Global deduplication, Pack blobs, Client side encryption.

File Storage · head to head

Ceph vs Kopia

Ceph

File Storage

Open source distributed storage providing object, block and file from one cluster

From: Free
Rated: -

Full review Website

Kopia

Backup

Open source deduplicating backup with client side encryption and a repository on almost any storage

From: Free
Rated: -

Full review Website

The short version

Each has a real cost: Ceph ceph assumes an operator who understands placement groups, CRUSH rules and recovery tuning, so organisations without dedicated storage staff routinely end up with a cluster that works until the first failure and then does not.; Kopia space is only reclaimed when maintenance runs, and in a shared repository full maintenance is owned by one client, so if that machine goes away the repository grows for ever while every backup still reports success.
They diverge on capability: Ceph covers RADOS object store, Kopia covers Content defined chunking.
Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Ceph and Kopia actually diverge.

Attributes where Ceph and Kopia differ
Attribute	Ceph	Kopia
Platforms	Linux	Linux, macOS, Windows, Docker
Category	File Storage	Backup

Identical on both: starting price (Free), pricing model (Open source, no licence fee), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Ceph

RADOS object store
RADOS Gateway
RBD block devices
CephFS
CRUSH placement
Erasure coded pools

Only in Kopia

Content defined chunking
Global deduplication
Pack blobs
Client side encryption
Desktop and command line
Repository verification

What people use each for

The jobs each tool is most often brought in to do.

Ceph

Backing a private cloud where virtual machine disks, shared filesystems and an S3 endpoint all need the same hardwarenot Kopia
Growing past the point where a proprietary array upgrade costs more than a rack of commodity serversnot Kopia
Research and media environments with petabytes of data and staff who can operate storagenot Kopia
Providing an S3 endpoint on premises with multi site replication under your own controlnot Kopia

Kopia

Backing up laptops and workstations to cheap object storage with a desktop interface rather than a cron jobnot Ceph
Deduplicating backups of several similar machines into one repository so common content is stored oncenot Ceph
Replacing a chunk based tool whose per object charges made a cheap bucket expensivenot Ceph
Keeping an encrypted offsite copy where the storage provider must never be able to read the contentsnot Ceph

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Ceph

Ceph assumes an operator who understands placement groups, CRUSH rules and recovery tuning, so organisations without dedicated storage staff routinely end up with a cluster that works until the first failure and then does not.
Small clusters are inefficient: three way replication means a third of raw capacity is usable, and erasure coding needs enough failure domains to be safe, so the economics only work above a certain size.
Recovery and rebalancing generate heavy internal traffic, so a failed disk can degrade client latency across the cluster unless backfill is throttled correctly beforehand.
Upgrades must follow a strict daemon order across monitors, managers, OSDs and gateways, and a mistake in that order on a live cluster is difficult to reverse.
Because it is self hosted, every byte served to the internet is transit you pay for on your own links, so the free licence does not mean free egress and bandwidth planning becomes your problem rather than the providers.

Kopia

Space is only reclaimed when maintenance runs, and in a shared repository full maintenance is owned by one client, so if that machine goes away the repository grows for ever while every backup still reports success.
The repository format has changed across versions and mixing client versions against one repository is discouraged, so a fleet must be upgraded together rather than machine by machine.
There is no central orchestration or reporting for many machines, so monitoring a fleet means building your own alerting around exit codes.
Restoring many small files is slower than the backup was, because content must be reassembled from pack blobs, and this is rarely tested until the day it matters.
Encryption is client side with no escrow, so a lost repository password means the data is unrecoverable and there is no vendor to appeal to.

Pricing, plan by plan

Ceph

Free

CephFree
- Full functionality, no capacity limit
- Object, block and file interfaces
- Community support via mailing list and Slack

Kopia

Free

KopiaFree
- Full functionality, no data limit
- Desktop application included
- Any supported storage back end

Which should you pick?

Choose Ceph if

You need rados object store.
You want to start without paying.
You work on Linux.
You also want rados gateway.

Ceph review

Choose Kopia if

You need content defined chunking.
You want to start without paying.
You work on Linux, macOS, Windows, Docker.
You also want global deduplication.

Kopia review

Questions people ask

Is Ceph or Kopia better?: Neither clearly leads. Ceph starts at Free and Kopia at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Ceph or Kopia?: Ceph starts at Free and Kopia at Free.
Does Ceph or Kopia run on more platforms?: Ceph runs on Linux. Kopia runs on Linux, macOS, Windows, Docker.
Can I use Ceph for free?: Both have a free tier, so you can try either at no cost before committing.
What is Ceph best used for?: Ceph is most often used for backing a private cloud where virtual machine disks, shared filesystems and an s3 endpoint all need the same hardware, growing past the point where a proprietary array upgrade costs more than a rack of commodity servers, research and media environments with petabytes of data and staff who can operate storage, providing an s3 endpoint on premises with multi site replication under your own control. Of those, backing a private cloud where virtual machine disks, shared filesystems and an s3 endpoint all need the same hardware and growing past the point where a proprietary array upgrade costs more than a rack of commodity servers are not what Kopia is typically brought in for.
What can Ceph do that Kopia cannot?: Ceph covers RADOS object store, RADOS Gateway, RBD block devices, CephFS. Kopia covers Content defined chunking, Global deduplication, Pack blobs, Client side encryption.

Answered from the vendors’ own pages

Ceph: How many nodes do I need to start?

Three is the practical minimum for a replicated cluster with real fault tolerance, and most production advice starts at five once you account for maintenance windows.

Kopia: Is a partly corrupt repository still restorable?

Partly. Deduplication means one damaged pack blob affects every snapshot referencing its contents, but unaffected files still restore. Run verification regularly rather than assuming.

Ceph: Is it faster than a SAN?

Not on single stream latency. It wins on aggregate throughput and on growing without a forklift upgrade, which is a different property from raw speed.

Kopia: How does it compare with restic?

Similar guarantees, with packing that behaves better on per operation billing, a desktop interface, and compression enabled by default.

Ceph: Can I buy support?

Yes. IBM sells IBM Storage Ceph and SUSE and others have offered supported builds; the upstream project itself is free.

Kopia: Do I need to run maintenance manually?

It is scheduled automatically by default, but you must ensure the client that owns full maintenance keeps running, otherwise deleted snapshots never free space.

Ceph: Should I use it just for S3?

If object is all you need, a dedicated object store is simpler to run. Ceph earns its complexity when you need block and file as well.

Kopia: Can several machines share one repository?

Yes, and that is where deduplication pays off, but they should run compatible versions and only one owns full maintenance.

Ceph vs Kopia

Ceph

Kopia

The short version

Where they differ

What each one covers

Only in Ceph

Only in Kopia

What people use each for

Ceph

Kopia

Where each one falls short

Ceph

Kopia

Pricing, plan by plan

Ceph

Kopia

Which should you pick?

Choose Ceph if

Choose Kopia if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on Ceph

More on Kopia

Keep looking

Other head to heads