HPE StoreOnce vs Dell PowerProtect Data Domain for Backup

Both are purpose-built deduplication backup appliances. The biggest practical difference is the optimized protocol: HPE StoreOnce uses Catalyst, while Dell PowerProtect Data Domain uses DD Boost. Catalyst is tightly tied to the HPE ecosystem and Veeam, while DD Boost is very broadly adopted across many backup ISVs and databases.

HPE StoreOnce uses approximately 4KB variable-length chunking with SHA-1 fingerprinting and supports inline and source-side dedupe. Dell Data Domain uses stream-informed segment dedupe with global compression via DD Boost. Real-world reduction ratios depend heavily on data type and retention, so both should be sized against your actual backup mix rather than a headline ratio.

HPE StoreOnce has strong Catalyst integration with Veeam and the StoreOnce 5260/5660 have passed Veeam Ready Repository validation, enabling source-side dedupe and fast synthetic operations. Dell Data Domain also works well with Veeam over DD Boost. If you are Veeam-first and want the tightest source-side integration on a single HPE stack, StoreOnce is a natural fit; if you run Veeam alongside Commvault or NetWorker, Data Domain's DD Boost ubiquity is attractive.

Dell Data Domain offers Retention Lock in Governance and Compliance modes, enforcing WORM immutability for retention periods up to roughly 70 years. HPE StoreOnce provides Catalyst-based immutability and isolated secure copies. For strict regulatory WORM requirements, Data Domain's Compliance mode is the stronger story; for general ransomware resilience, both provide immutable, air-gappable copies.

The HPE StoreOnce 5660 scales from about 144 TB to roughly 1.1 PB usable locally and is rated up to about 105 TB/hr with Catalyst, with Cloud Bank Storage extending capacity further. Top-end Dell Data Domain systems scale to roughly 1.5 PB usable in a single system with very high aggregate DD Boost throughput. We size the specific model to your retention, change rate and backup window.

Yes. HPE StoreOnce uses Cloud Bank Storage as a Catalyst Copy target to place deduplicated copies in object storage for DR and archive. Dell Data Domain provides Cloud Tier and Cloud DR to public cloud object storage. Both keep data deduplicated on the way out, so cloud egress and storage costs stay low.

Uniqcli is an authorized HPE reseller and can source HPE StoreOnce, and quote Dell PowerProtect Data Domain alongside it, for public-sector and government buyers. We can support compliant procurement and help align with vehicles such as GPC, SAP, and FAR, and address TAA considerations for your environment. Contact us with your contract requirements and we will scope the right configuration and paperwork.

HPE StoreOnce can be acquired as CapEx or consumed through HPE GreenLake for pay-per-use backup capacity, while Dell Data Domain offers CapEx or Dell APEX subscription options. Consumption models help when backup capacity growth is unpredictable; CapEx is often cheaper over a long, stable retention horizon. We can model both for your retention plan.