Dell PowerProtect Data Domain holds a prominent position as an enterprise backup target thanks, among other factors, to DD Boost, a technology that offloads part of the deduplication process to the server sending the data, reduces traffic to storage, and takes certain operations off the backup software’s plate. Its integration with Veeam Backup & Replication is especially deep, though a fair comparison today calls for some nuance: ExaGrid and HPE StoreOnce also have specific Veeam integrations and propose different architectures that can be advantageous depending on the scenario.
Data Domain and DD Boost: the key points in 30 seconds
- DD Boost can perform segmentation, filtering, and compression on the gateway server, sending only unique blocks to Data Domain.
- Veeam supports Virtual Synthetic Fulls, Retention Lock, in-transit encryption, and other DD Boost-specific features.
- ExaGrid relies on a non-deduplicated Landing Zone to speed up recent restores, then deduplicates in the background.
- HPE StoreOnce Catalyst also supports source-side deduplication and immutability integrated with backup applications.
- Data Domain’s advantage lies more in its combination of efficiency, maturity, and integration than in any universal superiority.
For years, deduplication was one of the biggest arguments for deploying specialized backup appliances. With datasets running into hundreds of terabytes or several petabytes, repeatedly storing the same blocks can multiply the capacity needed and increase traffic between proxies, backup servers, and storage.
Data Domain tackled that problem with a deduplication architecture that Dell has kept building on with DD Boost. The important difference isn’t just about compressing data once it reaches the appliance. DD Boost lets the software sending the data and Data Domain itself work together to determine what information actually needs to cross the network.
Veeam acknowledges these advantages in its own documentation and recommends using Data Domain through DD Boost rather than a plain file-protocol-based integration. Supported features include Distributed Segment Processing, Virtual Synthetic Fulls, in-transit encryption, stream control, and Retention Lock.
What DD Boost Actually Does With Veeam
One of the most significant features is Distributed Segment Processing.
Without this feature, the gateway sends blocks to Data Domain and the appliance handles segmentation, filtering, and compression there. With Distributed Segment Processing enabled, part of that work shifts to the gateway.
The result is that only the segments Data Domain actually needs to receive have to travel to the storage system.
This can matter a lot when the repository sits behind limited links, or when many proxies are sending backups at the same time. Less data transported means less network utilization and less work for the appliance afterward.
It’s worth avoiding a blanket figure like “it always cuts traffic by 95%,” though. The actual reduction depends on data repetition, change rates, retention, application type, encryption, compression, and the backup set involved.
Another strong point comes with Virtual Synthetic Fulls.
A traditional Synthetic Full generates a new full backup using the blocks already present in the repository plus the subsequent incrementals. On conventional storage, this operation can trigger considerable amounts of reads and writes.
With Data Domain, Veeam can lean on the appliance’s technology to build the full backup through references to existing segments, reducing the physical movement of data.
Veeam’s own documentation notes that these Virtual Synthetic Fulls reduce the load on the network and on the rest of the infrastructure’s components. Dell recommends configuring weekly Synthetic Fulls when using DD Boost in certain Veeam designs.
This feature is especially useful in environments with long retention policies. Creating new full recovery points without having to physically rewrite all their data cuts down one of the traditionally most expensive operations in a backup infrastructure.
Data Domain vs. ExaGrid: Two Different Philosophies
The comparison with ExaGrid is usually framed as inline deduplication versus a Landing Zone architecture, but it would be wrong to reduce it to ExaGrid lacking Veeam integration.
ExaGrid has a specific integration with Veeam.
Veeam installs a persistent Data Mover on the appliance and uses its ExaGrid-Veeam Accelerated Data Mover. In fact, Veeam’s own best-practices guide recommends using ExaGrid in integrated mode and acknowledges advantages for Synthetic Fulls, Instant Recovery, SureBackup, and other operations.
The difference is fundamentally architectural.
ExaGrid uses a Landing Zone where it keeps recent backups undeduplicated. It then runs its Adaptive Deduplication on that data and moves it to the deduplicated retention tier.
That requires setting aside storage to keep at least part of the backup in undeduplicated form. Veeam notes that the Landing Zone needs enough space to hold at least one uncompressed full backup plus one incremental.
From a pure capacity-efficiency standpoint, Data Domain avoids having to keep that recent full copy in a separate, non-deduplicated area.
But ExaGrid is deliberately chasing a different advantage: restoring the most recent backups without needing to rehydrate them from a deduplicated structure.
That’s an important difference.
Inline deduplication appliances tend to be very efficient at writing and retaining huge volumes of backups, but operations requiring lots of random reads can suffer a performance hit from data reconstruction. Veeam’s guide acknowledges exactly this general limitation of deduplicating appliances and calls out, as an exception, systems that have a fast tier holding non-deduplicated data.
So ExaGrid’s Landing Zone does consume additional capacity, but it can’t simply be written off as “wasted disk.” It’s part of an architectural decision aimed at improving certain recovery scenarios.
For a company whose priority is maximizing physical storage reduction, Data Domain’s approach may be more appealing. For one that especially values fast restores of the most recent recovery points, ExaGrid’s architecture can make sense.
StoreOnce Catalyst Competes Directly With DD Boost
HPE StoreOnce deserves even more care in any comparison, because Catalyst shares several ideas with DD Boost.
StoreOnce Catalyst lets you choose between target-side and source-side deduplication.
With its low-bandwidth transfer policy, the server sending the data runs deduplication and transmits only unique data to StoreOnce. In other words, it’s not accurate to claim DD Boost is the only system in this group capable of cutting traffic before it reaches the appliance.
HPE also maintains a specific integration with Veeam.
Catalyst Copy lets you move already-deduplicated backups between StoreOnce systems without having to reconstruct and send all the original data, while current versions include controlled immutability mechanisms both from the server and from compatible ISV applications.
HPE also recommends source-side Catalyst deduplication for certain backups transmitted over WAN links.
That’s why claiming StoreOnce “clearly lags behind” Data Domain in every scenario would need independent, comparable benchmarks run with equivalent configurations.
There’s no universal deduplication ratio that lets you rank these platforms.
An encrypted database that changes extensively between backups can deduplicate very differently than hundreds of virtual machines created from the same template. Retention period, block size, the applications being protected, compression, and encryption all play a role too.
Where Data Domain Still Holds Especially Strong Arguments
Stripping away the marketing hype doesn’t diminish Data Domain’s technical advantages. If anything, it makes it easier to pinpoint where its value actually lies.
The first is the maturity of DD Boost and its integration with Veeam.
Veeam doesn’t treat Data Domain as just a storage target to write to over NFS or SMB. With DD Boost, it can tap the appliance’s specific capabilities to filter data, generate Synthetic Fulls, manage streams, encrypt traffic, and apply immutability.
The second advantage is distributed deduplication.
Reducing data before transporting it is especially appealing when the logical volume being protected is huge, or when remote repositories are involved. The actual savings will depend on the workload, but avoiding the transport of already-stored segments is a clear architectural advantage.
The third shows up in Retention Lock.
Veeam can configure immutability for backups stored on Data Domain using Retention Lock. Once the corresponding period is applied, the data can’t normally be deleted until it expires.
Veeam does flag some operational conditions, though. Its standard configuration uses Data Domain Retention Lock’s Compliance mode, while Governance requires additional setup. Immutability also shouldn’t be described as “impenetrable” protection: credentials, management servers, the network, administrative accounts, and the rest of the backup chain still need to be secured.
ExaGrid and StoreOnce also offer immutability mechanisms, so this capability isn’t exclusive to Dell either. The difference again comes down to how it’s integrated, managed, and combined with the rest of the architecture.
Deduplicating More Doesn’t Automatically Mean a Lower TCO
There’s another claim worth qualifying when comparing these systems: that greater data reduction automatically guarantees a lower total cost of ownership, or TCO.
The physical storage required is an important part of the equation, but not the only one.
In an enterprise infrastructure, the appliance’s price, licensing, maintenance, expansions, network, power, rack space, support, replication, restore performance, backup duration, and the time needed to recover services after an incident all matter too.
Even a deduplication ratio needs to be evaluated carefully.
A vendor might advertise reduction ratios of 10:1, 20:1, 30:1, or higher, but the figure that should be used to size a project is the one that applies to the customer’s actual data, not the maximum achieved with a different workload.
Two companies protecting 1 PB of logical data can end up needing very different amounts of physical storage.
There’s also a trade-off between capacity and recovery. A heavily deduplicated architecture can require more work to reconstruct data during certain restores. A Landing Zone consumes more storage, but keeps a recent portion of the backup immediately available.
That’s why effective cost per terabyte is useful, but not sufficient on its own.
For large-scale Veeam environments, Data Domain still offers a combination that’s hard to ignore: global deduplication, distributed processing via DD Boost, Synthetic Fulls offloaded to storage, Retention Lock integration, and a platform designed specifically to protect large volumes of data.
That explains its staying power in the enterprise market better than simply presenting it as an outright winner.
HPE StoreOnce Catalyst competes with a technically comparable architecture in several respects, including source-side deduplication. ExaGrid takes a different direction, sacrificing some immediate capacity efficiency to maintain a non-deduplicated area geared toward fast recovery.
The right decision ultimately depends on what problem the backup team is trying to solve: backup window, bandwidth, density, restore performance, immutability, replication, future growth, or operating cost.
Data Domain still makes a very solid case when several of those requirements come up at once. And DD Boost remains probably one of the pieces that best explains why Data Domain is still present in so many enterprise backup architectures.
Frequently Asked Questions
What is DD Boost in Data Domain?
DD Boost is Dell’s technology for integrating backup applications with PowerProtect Data Domain and distributing certain deduplication tasks between the server sending the data and the appliance. With Veeam, it also enables features like Virtual Synthetic Fulls, in-transit encryption, and Retention Lock.
Does DD Boost reduce network traffic with Veeam?
Yes. Distributed Segment Processing performs segmentation, filtering, and compression on the gateway and sends only the necessary segments to Data Domain. The reduction percentage depends on the data, and no fixed figure should be assumed across all environments.
Is Data Domain better than ExaGrid for Veeam?
It depends on the priority. Data Domain focuses on high deduplication efficiency and deep integration through DD Boost, while ExaGrid keeps a Landing Zone with recent, undeduplicated backups to favor certain fast restores.
Does HPE StoreOnce Catalyst also do source-side deduplication?
Yes. StoreOnce Catalyst has a transfer policy that performs deduplication on the source server and sends only unique data to the appliance, so conceptually it competes directly with one of DD Boost’s main advantages.
