Datto Appliance: An Inside Look at Hardware Specs & Pricing for 2026

Overview of Datto’s Appliances

The Datto appliance is the foundation of Datto’s unified backup and recovery solutions. It’s a dedicated backup device that resides on site to back up your data and replicate it to the Datto Cloud.

In this post, we take an inside look at Datto’s flagship appliance (SIRIS), including key benefits, specifications, Datto SIRIS pricing and how it compares to other Datto appliances.

What is a Datto appliance?

A Datto appliance is dedicated hardware for data backup and recovery. It’s the central component of Datto’s all-in-one BCDR solutions, which unify a local backup device with redundant off-site storage in the Datto Cloud. When data loss occurs, files or systems can be restored from the appliance or from the Datto Cloud.

Benefits of Datto appliances

The key benefit of deploying a Datto backup appliance is that it provides dedicated resources for backup and recovery processes. This enables faster, more frequent backups and faster restore times, especially when using virtualization or performing full restores of entire machines.

Another primary benefit of Datto’s appliances is their tight integration with the Datto Cloud. This creates a fully unified BCDR solution that enables backup and recovery locally and in the cloud.

Below, we outline the many additional capabilities of Datto’s backup systems, including Inverse Chain Technology and built-in ransomware detection. But first, let’s look at what’s under the hood.

Datto Appliance features & hardware specs (SIRIS)

Datto SIRIS 6

The Datto SIRIS 6 is Datto’s flagship BCDR solution, with appliance options available in varying sizes and form factors, offering storage capacities ranging from 2TB to 60TB. This enables organizations to deploy the right backup device for their infrastructure and continuity objectives.

Note: At Kaseya Connect, Datto announced upcoming support for agentless Hyper-V backups in SIRIS—reducing deployment complexity and making it easier for organizations transitioning from VMware.

Who this is for:

• Small-, Mid- and Enterprise Organizations: Designed for businesses with high-density data environments that require large storage capacities (up to 120TB) and the highest level of hardware performance.
• High-Security Environments: Ideal for organizations with strict compliance or security needs, as it includes advanced features like FIPS-mode encryption and automated ransomware scanning.
• Businesses with Low RTO/RPO Needs: Best for companies that cannot afford downtime and require near-instant local or cloud virtualization to keep operations running.

Hardware specifications

Tip: Datto groups its SIRIS appliances into three levels, using naming conventions that denote the storage capacity. For example, the SIRIS 6-2 (or S6-2) denotes a storage capacity of 2TB, whereas S6-60 is the 60TB device.

For more information, view our Datto SIRIS 6 page.

Additional Datto appliances

In addition to the SIRIS models highlighted above, Datto offers a few other backup devices to fit the needs of different organizations.

Datto SIRIS 6 Desktop

The Datto SIRIS 6 Desktop (S6-D) is the compact desktop version of the SIRIS 6. It weighs roughly 15 pounds and is designed with a dedicated 256GB m.2 NVMe solid-state OS drive. Capacity scales from roughly 2TB up to 24TB. It’s a great option for businesses with varying backup requirements and/or those that do not use a server rack.

Who this is for:

• Branch or Remote Offices: A perfect fit for professional offices (law firms, medical practices, etc.) that need enterprise-grade BCDR but do not have a dedicated server rack.
• Mid-Sized Workgroups: Tailored for environments needing more storage and performance than a MiniPC can provide, but with a smaller physical footprint than a rackmount server.
• Distributed IT Infrastructures: Useful for businesses managing multiple physical locations where local virtualization capability is needed on-site at each branch.

Hardware specifications:

• Form factor: Desktop
• Capacity: 1860GiB to 22320GiB (approx. 2TB to 24TB)
• RAID: RAID 1 (mirror) or RAID Z1
• Dedicated OS drive: 256GB m.2 NVMe SSD
• CPU: AMD EPYC 4245P or AMD EPYC 4345P
• RAM: 32GB to 64GB DDR5 UDIMM ECC
• NIC: 2x 10G Copper
• Weight: 15.0 lbs to 16.5 lbs (6.81 kg to 7.49 kg)

Datto SIRIS 6X appliance

Device Layout

1. Power button with LED indicator
2. Universal Audio Jack (Not used)
3. Line Out (Not used)
4. USB 3.0. Type A
5. USB 3.0. Type C
6. Power connection
7. DisplayPort
8. HDMI port
9. USB Type A (x4)
10. Gigabit Ethernet Network Interface Port with LAN LED indicators

Even smaller than the SIRIS Desktop (but still mighty) is the Datto SIRIS 6X Appliance (or S6-X). This is the MiniPC version of the SIRIS 6. It weighs just over 3 pounds and features a solid-state 256GB NVMe OS drive, delivering faster speeds and performance in a highly compact footprint. Capacity is available in 2TB (S6-X) and 4TB (S6-X4) storage options, making it ideal for businesses with smaller backup requirements that need enterprise-grade data protection without a server rack.

Who this is for:

• Small Businesses & Retail: Designed for “lean” IT environments, such retail shops, small clinics or any businesses that need powerful protection in a device roughly the size of a book.
• Resource-Constrained Locations: Ideal for sites with limited space or power, offering a silent, compact form factor without sacrificing the core SIRIS software features.
• Single-Server Protections: Best for businesses only protecting one or two critical machines where a full-sized rackmount would be overkill.

Hardware specifications:

• Form factor: MiniPC
• Capacity: 1860GiB to 3719GiB (approx. 2TB or 4TB)
• Array: Non RAID
• Dedicated OS drive: 256GB NVMe m.2 SSD
• Storage drive: 2TB or 4TB NVMe m.2 SSD
• CPU: AMD Processor
• RAM: 16GB DDR5 non-ECC SODIMM (2x 8GB)
• NIC: 1x 1GbE Copper
• Weight: 3.05 lbs (1.38 kg)

Datto ALTO 5 appliance

The Datto ALTO is a MicroPC backup appliance built for smaller organizations. Like the S6X, ALTO features solid-state OS and storage drives for fast backups, restores and VMs. Capacity is 2TB, making it ideal for businesses with smaller backup requirements.

Who this is for:

• Price-Conscious Small Businesses: Built specifically for small organizations looking for an entry-level, cost-effective BCDR solution that bypasses the complexity of enterprise hardware.
• Companies with Minimal Agents: Best suited for environments protecting up to four machines (agents), focusing on essential recovery and cloud-first safety.
• Startups or Basic IT Needs: Ideal for businesses that primarily need a reliable “set it and forget it” backup with the peace of mind of 1-click cloud disaster recovery.

 Hardware specifications:

• Form factor: MicroPC
• Capacity: 2TB
• Storage drive: 2TB NVMe m.2 SSD
• Dedicated OS drive: 256GB SATA m.2 SSD
• CPU: Celeron 7305 (5c/5t, 1.10 GHz)
• RAM: 8GB DDR4 (1x8GB) non-ECC
• NIC: 1x 1GbE
• Weight: 6.5 oz (0.18 kg)

Datto Networking Appliance

The Datto Networking Appliance is not a backup device, but it’s worth mentioning here as it’s another example of dedicated on-prem hardware provided by Datto. The Datto Networking Appliance (DNA) is a high-performance router with fully integrated 4G LTE failover, built-in firewall and intrusion detection. It’s one of several networking products offered by Datto, including Wi-Fi access points and switches.

Choosing the right Datto backup appliance

Since Datto offers several different appliances, organizations must be careful to deploy the right backup device for their needs. Datto provides some helpful tips on properly sizing an appliance. But as a general rule of thumb, companies should choose their device based on how much data they need to back up and how many machines.

Datto recommends selecting an appliance with a storage capacity that’s at least 2 times greater than the used disk space on the protected machine (this practice is referred to as the 2-3x multiplier rule). For example, if you’re backing up a 2TB server, then you may want to deploy a Datto SIRIS 4TB appliance or larger.

The table below provides a general guideline for selecting the appropriate appliance for the number of agents to be installed.

Note: These are just rough estimates provided by Datto as a guideline. Actual usage of devices by agent quantity can vary significantly depending on a variety of factors, including configuration, encrypted agents, and the volume of data being protected.

Datto’s appliance-free backup solutions

In addition to the physical SIRIS and ALTO devices, Datto also offers appliance-free backup solutions for protecting endpoints and servers. These solutions provide direct-to-cloud backup, which means that files are backed up directly to the Datto Cloud, bypassing the need for an on-site appliance.

• Endpoint Backup: Protects Windows servers, virtual machines (VMs), cloud instances, desktops and laptops with the ability to restore individual files and folders or perform a full bare-metal restore.
• Endpoint Backup with Disaster Recovery: Protects all production workloads on Linux and Windows servers & PCs, with the ability to spin up workloads in the Datto Cloud, in addition to other restore methods.

Backup & recovery capabilities

It’s important to remember that a Datto appliance is just one piece of a multilayered backup and recovery solution. The device is driven by Datto’s robust backup software, which is seamlessly integrated with the Datto Cloud. This creates a fully integrated BCDR stack with several capabilities that make it unique from competitors’ backup products:

• Inverse Chain Technology: Every incremental snapshot is a fully constructed recovery point, making backups faster and more resilient, while also eliminating the need for slow chain rebuilds.
• Ransomware protection: All backups are automatically scanned for ransomware as part of the backup process.
• Fast recoveries: Protected files, folders and entire systems can be recovered in seconds from the Datto appliance or the Datto Cloud via several restore options.
• Instant virtualization: Backups can be booted as virtual machines (locally, in the cloud or hybrid) for instant access to protected systems.
• Rapid Rollback: Major unwanted changes, such as a ransomware infection, can be quickly reversed without needing to reimage an entire machine.
• Cloud Defense: Even if cloud backups are deleted (accidentally or maliciously), Datto offers a failsafe to promptly undo the deletion.
• Backup Verification: Backups are automatically test-boosted to ensure they are viable. Plus, Datto’s Backup Verification provides script execution to verify that applications are accessible.
• Backup Insights: Datto’s web-based interface makes it easy to locate and restore lost data by identifying file changes between any two backup points.
• Security: Datto employs the highest security standards across its backup devices and cloud storage, including end-to-end data encryption, multi-factor authentication and ransomware-proof ZFS snapshot files.

Pricing for Datto hardware

Pricing for a Datto SIRIS 6 appliance starts at $1,095, but some of the upfront hardware costs may be discounted fully with certain deployments or manage-service agreements. Pricing will also vary based on the appliance model and storage capacity, as well as the number of devices you need to protect and the desired length of data retention in the Datto Cloud. Given the variable costs of each deployment, the best way to get accurate pricing is to request a quote.

Datto SIRIS vs. alternative solutions

If you’re comparing BCDR options, here’s how Datto SIRIS stacks up against comparable systems from other providers.

Reviews & testimonials

Datto’s appliances are highly regarded for their reliability, performance and ease of deployment. In independent reviews, users consistently cite Datto’s robust hardware and integrated cloud as key factors that deliver a better backup and recovery solution than competing products.

Datto SIRIS currently has an 8.6 score out of 10 on TrustRadius with 96 reviews. Among Datto reviews from our own clients at Invenio IT, one customer stated: “The Datto SIRIS is simply the most important device in our network rack. This ingenious device has saved the day in many emergencies while migrating files and making hardware upgrades.”

Conclusion

Datto’s appliances bolster a company’s data protection by providing dedicated hardware for backup and recovery. These local devices are fully integrated with the Datto Cloud, providing redundant off-site storage with the ability to restore data instantly from the cloud or the on-premises appliance. Datto offers a variety of appliance options for its SIRIS and ALTO BCDR solutions, enabling organizations to deploy the right hardware for their infrastructure.

Which Datto appliance is right for you?

Schedule a meeting with one of our data-protection specialists at Invenio IT to identify the right Datto backup solution for your organization’s needs. You can also reach our experts by calling (646) 395-1170 or emailing success@invenioIT.com.