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File Storage · head to head

Cloudian vs Datto SIRIS

Cloudian logo

Cloudian

File Storage

S3-compatible on-premises object storage with object lock immutability

From
On request
Rated
-
Full reviewWebsite
Datto SIRIS logo

Datto SIRIS

Backup

All-in-one business continuity and disaster recovery

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

The short version

  • Each has a real cost: Cloudian you operate the hardware, so capacity planning, firmware, node failures and a refresh cycle every five years return as costs that a public cloud bill hides.; Datto SIRIS requires on-premises appliance, not purely cloud-native
  • They diverge on capability: Cloudian covers S3 API compatibility, Datto SIRIS covers Instant virtualization.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

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

Attributes where Cloudian and Datto SIRIS differ
AttributeCloudianDatto SIRIS
Starting priceOn request$1095/one-time + recurring
Pricing modelquoteUnknown
PlatformsLinuxLinux, Virtual Environments
CategoryFile StorageBackup
FoundedUnknown2011

Identical on both: free tier (No), 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 Cloudian

  • S3 API compatibility
  • Object Lock
  • Erasure coding
  • Multi-tenancy
  • Hybrid tiering
  • HyperStore appliances

Only in Datto SIRIS

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

What people use each for

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

Cloudian

  • A backup team needing an immutable target so a compromised administrator account cannot delete the backupsnot Datto SIRIS
  • An organisation restoring hundreds of terabytes regularly where public cloud egress charges make cloud storage untenablenot Datto SIRIS
  • A university or government body with data residency rules preventing use of public cloud object storagenot Datto SIRIS
  • A media archive holding petabytes of finished content where per-terabyte capital cost beats per-gigabyte monthly cloud feesnot Datto SIRIS

Datto SIRIS

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

Where each one falls short

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

Cloudian

  • You operate the hardware, so capacity planning, firmware, node failures and a refresh cycle every five years return as costs that a public cloud bill hides.
  • Per-terabyte licensing plus servers means high upfront cost, and the crossover point against public cloud only arrives at meaningful scale, typically hundreds of terabytes and up.
  • S3 compatibility is high but not identical to Amazon, so occasional applications depending on newer or less common S3 features need testing rather than assumption.
  • Small deployments need a minimum node count for erasure coding to be meaningful, which sets a practical floor on entry cost regardless of how little data you have.
  • Performance is object storage performance, so it is not a substitute for block or high-throughput file storage and buyers occasionally deploy it for the wrong workload.

Datto SIRIS

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

Pricing, plan by plan

Cloudian

On request
  • Cloudian HyperStore$undefined/year
    • Licensed per usable terabyte, subscription or perpetual
    • Software-only on your hardware or as Cloudian appliances
    • No egress or API request charges

Datto SIRIS

$1095/one-time + recurring

No published plan breakdown. See the Datto SIRIS review.

Which should you pick?

Choose Cloudian if

  • You need s3 api compatibility.
  • You work on Linux.
  • You also want object lock.
Cloudian review

Choose Datto SIRIS if

  • You need instant virtualization.
  • You work on Linux, Virtual Environments.
  • You also want screenshot verification.
Datto SIRIS review

Questions people ask

Is Cloudian or Datto SIRIS better?
Neither clearly leads. Cloudian starts at On request and Datto SIRIS at $1095/one-time + recurring, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cloudian or Datto SIRIS?
Cloudian starts at On request and Datto SIRIS at $1095/one-time + recurring.
Does Cloudian or Datto SIRIS run on more platforms?
Cloudian runs on Linux. Datto SIRIS runs on Linux, Virtual Environments.
What is Cloudian best used for?
Cloudian is most often used for a backup team needing an immutable target so a compromised administrator account cannot delete the backups, an organisation restoring hundreds of terabytes regularly where public cloud egress charges make cloud storage untenable, a university or government body with data residency rules preventing use of public cloud object storage, a media archive holding petabytes of finished content where per-terabyte capital cost beats per-gigabyte monthly cloud fees. Of those, a backup team needing an immutable target so a compromised administrator account cannot delete the backups and an organisation restoring hundreds of terabytes regularly where public cloud egress charges make cloud storage untenable are not what Datto SIRIS is typically brought in for.
What can Cloudian do that Datto SIRIS cannot?
Cloudian covers S3 API compatibility, Object Lock, Erasure coding, Multi-tenancy. Datto SIRIS covers Instant virtualization, Screenshot verification, Ransomware detection, Inverse chain technology.

Answered from the vendors’ own pages

Cloudian: Does object lock really stop ransomware deleting backups?

Within the retention period, yes, provided the lock is set in compliance mode. That is precisely why it is the common answer to backup-targeting ransomware.

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
Cloudian: Are there egress charges?

No. That is the central cost argument against public cloud object storage, and it only becomes visible when you have to restore at volume.

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
Cloudian: Can we use our own servers?

Yes, HyperStore is software-defined and runs on qualified commodity hardware, or you can buy Cloudian appliances if you would rather not certify your own.

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
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
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