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Backup · head to head

Datto SIRIS vs Kopia

Datto SIRIS logo

Datto SIRIS

Backup

All-in-one business continuity and disaster recovery

From
$1095/one-time + recurring
Rated
-
Full reviewWebsite
Kopia logo

Kopia

Backup

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

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Kopia has a free tier, so it costs nothing to try first.
  • Each has a real cost: Datto SIRIS requires on-premises appliance, not purely cloud-native; 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: Datto SIRIS covers Instant virtualization, Kopia covers Content defined chunking.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Datto SIRIS and Kopia actually diverge.

Attributes where Datto SIRIS and Kopia differ
AttributeDatto SIRISKopia
Starting price$1095/one-time + recurringFree
Pricing modelUnknownOpen source, no licence fee
Free tierNoYes
PlatformsLinux, Virtual EnvironmentsLinux, macOS, Windows, Docker
Founded2011Unknown

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 Datto SIRIS

  • Instant virtualization
  • Screenshot verification
  • Ransomware detection
  • Inverse chain technology
  • Cloud-first architecture
  • Automated DR testing
  • VMware
  • Hyper-V

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.

Datto SIRIS

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

Kopia

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

Where each one falls short

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

Datto SIRIS

  • Requires on-premises appliance, not purely cloud-native
  • Initial setup and hardware costs can be substantial for smaller MSPs

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

Datto SIRIS

$1095/one-time + recurring

No published plan breakdown. See the Datto SIRIS review.

Kopia

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

Which should you pick?

Choose Datto SIRIS if

  • You need instant virtualization.
  • You work on Linux, Virtual Environments.
  • You also want screenshot verification.
Datto SIRIS 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 Datto SIRIS or Kopia better?
Neither clearly leads. Datto SIRIS starts at $1095/one-time + recurring and Kopia at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Datto SIRIS or Kopia?
Kopia has a free tier; the other does not. Paid plans start at $1095/one-time + recurring for Datto SIRIS and Free for Kopia.
Does Datto SIRIS or Kopia run on more platforms?
Datto SIRIS runs on Linux, Virtual Environments. Kopia runs on Linux, macOS, Windows, Docker.
Can I use Kopia for free?
Yes. Kopia has a free tier, so you can try it without paying. Datto SIRIS starts at $1095/one-time + recurring.
What is Datto SIRIS best used for?
Datto SIRIS is most often used for data protection, disaster recovery, business continuity, ransomware protection. Of those, data protection and disaster recovery are not what Kopia is typically brought in for.
What can Datto SIRIS do that Kopia cannot?
Datto SIRIS covers Instant virtualization, Screenshot verification, Ransomware detection, Inverse chain technology. Kopia covers Content defined chunking, Global deduplication, Pack blobs, Client side encryption.

Answered from the vendors’ own pages

Datto SIRIS: What does SIRIS protect against?

Datto SIRIS includes immutable cloud backups, automated recovery verification, and integrated ransomware detection through Cloud Deletion Defense which undoes accidental or malicious backup deletion.

Source
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.

Datto SIRIS: What's the pricing model?

Datto SIRIS uses flat-rate pricing starting at $1,095, which includes installation, storage, VIP support, recoveries, two annual DR tests, and five-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.

Datto SIRIS: What integrations does SIRIS have?

Datto SIRIS integrates natively with Autotask PSA, Datto RMM, ConnectWise Automate, and ConnectWise PSA. It also supports virtualization platforms like vSphere and CentOS Linux.

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.

Datto SIRIS: Is SIRIS cloud-only or appliance-based?

Datto SIRIS is an on-premises appliance that backs up data to Datto's cloud. You do not need to maintain your own physical server infrastructure for the core SIRIS functionality.

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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