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Backup · head to head

Kopia vs MinIO

Kopia logo

Kopia

Backup

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

From
Free
Rated
-
Full reviewWebsite
MinIO logo

MinIO

File Storage

S3-compatible object storage server you run yourself, now under AGPL with a stripped community edition

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: 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.; MinIO the AGPL v3 licence applies copyleft over network use, so embedding MinIO in a product or hosted service obliges you to release your own source or buy a commercial licence, and legal review has removed it from several vendor stacks for this reason alone.
  • They diverge on capability: Kopia covers Content defined chunking, MinIO covers S3 API implementation.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Kopia and MinIO actually diverge.

Attributes where Kopia and MinIO differ
AttributeKopiaMinIO
PlatformsLinux, macOS, Windows, DockerLinux, macOS, Windows, Kubernetes, Docker
CategoryBackupFile Storage

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 Kopia

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

Only in MinIO

  • S3 API implementation
  • Erasure coding
  • Single binary deployment
  • Bucket replication
  • Object locking and versioning
  • Identity provider integration

What people use each for

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

Kopia

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

MinIO

  • Providing an S3 endpoint inside an air gapped or regulated network where a cloud bucket is not permittednot Kopia
  • Backing a Kubernetes platform with object storage that lives on the same hardware as the clusternot Kopia
  • Standing up S3 semantics in CI so tests exercise the same API path as productionnot Kopia
  • Fronting local disk shelves with an S3 interface so applications only ever learn one storage APInot Kopia

Where each one falls short

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

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.

MinIO

  • The AGPL v3 licence applies copyleft over network use, so embedding MinIO in a product or hosted service obliges you to release your own source or buy a commercial licence, and legal review has removed it from several vendor stacks for this reason alone.
  • The community edition console was reduced in 2025 to an object browser, so user, policy, bucket and configuration management now happen through the mc command line client or through the paid product, which is a real operational regression for teams that trained staff on the UI.
  • The vendor has changed the terms of the free edition twice, so planning long lived infrastructure around the community build carries the risk that the next change removes something you depend on.
  • Erasure coded deployments cannot be grown by adding single drives; capacity is added in server pools, so expansion is a hardware purchase in units rather than an incremental one.
  • Commercial pricing is capacity based and aimed at large deployments, so a team that outgrows the community edition faces an enterprise sized quote rather than a graduated upgrade path.

Pricing, plan by plan

Kopia

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

MinIO

Free
  • Community (AGPL v3)Free
    • Full server functionality
    • Erasure coding and replication
    • Object browser only in the web console
  • AIStor$undefined/year
    • Commercial licence removing AGPL obligations
    • Full management console
    • Vendor support with response commitments

Which should you pick?

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

Choose MinIO if

  • You need s3 api implementation.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Kubernetes, Docker.
  • You also want erasure coding.
MinIO review

Questions people ask

Is Kopia or MinIO better?
Neither clearly leads. Kopia starts at Free and MinIO at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kopia or MinIO?
Kopia starts at Free and MinIO at Free.
Does Kopia or MinIO run on more platforms?
Kopia runs on Linux, macOS, Windows, Docker. MinIO runs on Linux, macOS, Windows, Kubernetes, Docker.
Can I use Kopia for free?
Both have a free tier, so you can try either at no cost before committing.
What is Kopia best used for?
Kopia is most often used for backing up laptops and workstations to cheap object storage with a desktop interface rather than a cron job, deduplicating backups of several similar machines into one repository so common content is stored once, replacing a chunk based tool whose per object charges made a cheap bucket expensive, keeping an encrypted offsite copy where the storage provider must never be able to read the contents. Of those, backing up laptops and workstations to cheap object storage with a desktop interface rather than a cron job and deduplicating backups of several similar machines into one repository so common content is stored once are not what MinIO is typically brought in for.
What can Kopia do that MinIO cannot?
Kopia covers Content defined chunking, Global deduplication, Pack blobs, Client side encryption. MinIO covers S3 API implementation, Erasure coding, Single binary deployment, Bucket replication.

Answered from the vendors’ own pages

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.

MinIO: Can I still use MinIO for free?

Yes, the AGPL v3 server remains available and functional. What changed is the console, which no longer manages users, policies or configuration in the community build.

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.

MinIO: Does AGPL affect me if I only use it internally?

Internal use without offering the software over a network to third parties generally does not trigger the source obligation, but if MinIO forms part of a service you offer to others, it does. Take advice rather than a forum answer.

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.

MinIO: What replaced the community console features?

The mc client and the server admin API. Third party UIs exist but they are not maintained by MinIO.

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.

MinIO: Is it suitable as a Veeam or restic backup target?

Yes, object locking and versioning work and both tools treat it as standard S3. Immutability depends on configuring the lock policy at bucket creation.

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