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Backup · head to head

Kopia vs Unitrends Backup

Kopia logo

Kopia

Backup

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

From
Free
Rated
-
Full reviewWebsite
Unitrends Backup logo

Unitrends Backup

Backup

All-in-one backup and recovery appliance

From
$55/month
Rated
-
Full reviewWebsite

The short version

  • Only Kopia has a free tier, so it costs nothing to try first.
  • 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.; Unitrends Backup pricing is not transparent and requires contacting the company directly for a custom quote
  • They diverge on capability: Kopia covers Content defined chunking, Unitrends Backup covers Predictive analytics.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Kopia and Unitrends Backup actually diverge.

Attributes where Kopia and Unitrends Backup differ
AttributeKopiaUnitrends Backup
Starting priceFree$55/month
Pricing modelOpen source, no licence feesubscription
Free tierYesNo
PlatformsLinux, macOS, Windows, DockerOn-premises, Cloud, Hybrid
FoundedUnknown1989

Identical on both: user rating (Not yet rated), category (Backup).

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 Unitrends Backup

  • Predictive analytics
  • Automated recovery testing
  • Instant recovery
  • Ransomware detection
  • Adaptive deduplication
  • Cloud integration
  • VMware
  • Hyper-V

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 Unitrends Backup
  • Deduplicating backups of several similar machines into one repository so common content is stored oncenot Unitrends Backup
  • Replacing a chunk based tool whose per object charges made a cheap bucket expensivenot Unitrends Backup
  • Keeping an encrypted offsite copy where the storage provider must never be able to read the contentsnot Unitrends Backup

Unitrends Backup

  • Data protectionnot Kopia
  • Disaster recoverynot Kopia
  • Business continuitynot Kopia
  • Ransomware protectionnot Kopia
  • Compliancenot 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.

Unitrends Backup

  • Pricing is not transparent and requires contacting the company directly for a custom quote
  • Minimum pricing starts at approximately $995, limiting accessibility for very small deployments
  • Unified pricing approach means less flexibility for scaling individual components

Pricing, plan by plan

Kopia

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

Unitrends Backup

$55/month
  • Recovery Series$55/month
    • Predictive analytics
    • Instant recovery
    • Ransomware detection

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 Unitrends Backup if

  • You need predictive analytics.
  • You work on On-premises, Cloud, Hybrid.
  • You also want automated recovery testing.
Unitrends Backup review

Questions people ask

Is Kopia or Unitrends Backup better?
Neither clearly leads. Kopia starts at Free and Unitrends Backup at $55/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kopia or Unitrends Backup?
Kopia has a free tier; the other does not. Paid plans start at Free for Kopia and $55/month for Unitrends Backup.
Does Kopia or Unitrends Backup run on more platforms?
Kopia runs on Linux, macOS, Windows, Docker. Unitrends Backup runs on On-premises, Cloud, Hybrid.
Can I use Kopia for free?
Yes. Kopia has a free tier, so you can try it without paying. Unitrends Backup starts at $55/month.
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 Unitrends Backup is typically brought in for.
What can Kopia do that Unitrends Backup cannot?
Kopia covers Content defined chunking, Global deduplication, Pack blobs, Client side encryption. Unitrends Backup covers Predictive analytics, Automated recovery testing, Instant recovery, Ransomware detection.

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.

Unitrends Backup: What does Unitrends Backup include in its pricing?

Unitrends offers all-in-one backup and disaster recovery with a single flat rate including installation, storage, VIP support, and recoveries, plus two DR tests per year and a 5-year warranty.

Source
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.

Unitrends Backup: What are Unitrends' key disaster recovery features?

Unitrends provides instant recovery, automated recovery assurance, automatic testing capabilities to measure recovery time and points, ransomware protection with behavioral analysis, and bare metal recovery to dissimilar hardware.

Source
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.

Unitrends Backup: How long has Unitrends been in the backup market?

Unitrends was founded in 1989 and has over three decades of experience in backup and disaster recovery solutions, pioneering the first hardware-based backup appliance in 2002.

Source
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.

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