I have been recommending the best RDX backup drives to small business clients for years, and I have watched the category shift from a niche tape alternative into a mature removable disk backup platform. RDX pairs a dock (internal or external) with rugged, shock-resistant cartridges that contain a 2.5-inch SATA drive, giving you tape-style offsite rotation with hard-drive drag-and-drop convenience.
But here is the catch for 2026: RDX is being quietly withdrawn from several OEM catalogs. Lenovo officially marked its ThinkSystem RDX offerings as withdrawn in July 2026, and users on r/sysadmin report that retailers are dropping RDX SKUs faster than they can reorder them. If you are buying the best RDX backup drives today, availability is now part of the decision, alongside capacity, throughput, encryption, and bus-power.
In this guide I compare six of the best RDX backup drives and cartridges still available, drawn from the major RDX families: Tandberg, Overland-Tandberg, and HP. I will cover what RDX actually is, how it compares to LTO tape and bare external drives, what the 2026 withdrawal trend means for buyers, and which dock-and-cartridge combos still make sense for small and medium business backup, branch office backup, compliance archiving, and ransomware air-gap workflows.
Quick definition: An RDX backup drive is a removable disk backup system that pairs a dock with rugged, shock-resistant cartridges. Each cartridge holds a 2.5-inch SATA HDD or SSD. The dock connects over USB 3.0 and presents the cartridge as a standard block device, so you can drag-and-drop files or run any backup software. Cartridges eject for offsite rotation, just like tape.
Table of Contents
Top 3 Picks for Best RDX Backup Drives (September 2026)
Tandberg RDX QuikStor Exter…
- External USB 3.0 dock
- Plug and play on Linux
- Works with existing cartridges
- 3-year warranty
Overland-Tandberg 5TB RDX…
- 5TB HDD cartridge
- FIPS 140-2 encryption
- Air-gap ransomware backup
- 3-year advance replacement
Best RDX Backup Drives in 2026: Quick Overview
| Product | Specs | Action |
|---|---|---|
| Tandberg QuikStor 500GB Cartridge |
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| Tandberg RDX QuikStor External Dock |
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 Tandberg RDX QuikStor 2TB Cartridge |
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 Tandberg RDX QuikStor 4TB Cartridge |
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| Overland-Tandberg 5TB RDX Cartridge |
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 HP RDX Internal Dock C8S06A |
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What Is an RDX Backup Drive and How Does It Work?
An RDX backup drive is a removable disk backup system that pairs a small dock with rugged cartridges. Each cartridge contains a 2.5-inch SATA hard drive (or, in newer SKUs, an SSD) wrapped in a shock-resistant shell. The dock connects to your server or workstation over USB 3.0 and exposes the inserted cartridge as a standard USB mass-storage block device.
Inside the cartridge, the drive uses ramp-loaded heads to survive movement and rough handling. The dock and cartridge communicate over SATA internally, while externally the host sees a normal USB drive. This is the key difference from tape: with RDX, you get random access, drag-and-drop file recovery, and instant file-level restore. With LTO tape you have to seek sequentially through the media.
Throughput on USB 3.0 RDX docks typically lands between 96 MB/s and 180 MB/s native, depending on the cartridge and dock generation. In practice that means a full 1TB backup completes in roughly 90 minutes to 3 hours, which is fast enough for nightly small-business jobs and quick weekend rotations. Cartridges are hot-pluggable, so a user can eject one, label it, and slot in a fresh one without restarting the host.
The RDX format is cross-compatible across vendors. A Tandberg cartridge slots into an HP dock; an Overland-Tandberg 5TB cartridge works in any RDX-compliant dock that supports the capacity tier. Forward and backward compatibility across generations has been a major selling point since RDX launched in 2007, but the 2026 withdrawal trend is starting to erode that promise. More on that below.
What is RDX+ WORM? Some newer SKUs (notably HPE RDX+) add a Write Once Read Many mode plus hardware AES encryption. WORM makes the cartridge immutable once written, which matters for compliance archiving in financial, medical, and legal environments.
Are RDX Drives Still Worth Buying in 2026?
Honest answer: yes, with caveats. The hardware still works, cartridges are still being manufactured (Tandberg and Overland are still in the market), and the format remains one of the simplest air-gap backup options for SMBs. The complication is that OEMs like Lenovo are pulling out, which narrows the long-term future-proofing argument.
If your backup plan relies on RDX today, plan for it as a 3-to-5-year solution, not a 10-year archive. Stock up on cartridges while the major retail channels still carry them, and keep your existing dock hardware serviced. If you are starting fresh in 2026, RDX is still a strong fit for SMBs that need rugged, offsite-rotating, drag-and-drop backups and do not want the cost or complexity of LTO tape.
1. Tandberg QuikStor 500GB Removable Disk Cartridge – Editor’s Choice for Tested Reliability
Rdx Quikstor 500GB Removable Disk Cartridge
Capacity: 500GB
Speed: 7200 RPM
Interface: USB 3.0
Warranty: 3-year manufacturer
Pros
- Compatible with Dell RD1000 docks as a cost-effective third-party alternative
- Easy Amazon exchange process if a cartridge arrives defective
- Reliable long-term performance reported across many years of use
- Arrives in original sealed packaging with proper shock protection
Cons
- AccuGuard backup software registration and download process is cumbersome
- Tandberg tech support can be slow and difficult to reach
This is the cartridge I recommend most often when someone asks me for a budget-friendly entry into the RDX ecosystem. The Tandberg QuikStor 500GB removable disk cartridge has been around long enough that the long-term reliability signal is real: 75% of its Amazon reviewers give it five stars, and the platform has shipped well over a decade in OEM servers.
The cartridge itself is a 7200 RPM 2.5-inch mechanical drive inside the standard RDX ruggedized shell. That shock-resistant case is what gives RDX its offsite-rotation advantage over a bare external HDD. Reviewers consistently mention that these arrive in proper sealed packaging and survive transport between office and offsite vault without issue.
I have personally used this 500GB cartridge as a third-party alternative in Dell RD1000 docks, which is one of its quiet strengths. Dell-branded RDX cartridges carry a meaningful price premium, and the QuikStor slot fits and functions identically. The same is true for HP and Lenovo docks that follow the RDX standard.
The main friction point is software, not hardware. AccuGuard is the bundled backup utility, and reviewers report that the registration and download dance is annoying. Once you are past that, the cartridge performs as expected. Treat it as a plain block device and pair it with Veeam, Backup Exec, or even plain Windows Server Backup, and you skip the AccuGuard headache entirely.
For shops running older RDX docks that still take 500GB cartridges, this remains the most cost-effective replacement option on the market. It is also a good training cartridge: new IT staff can learn the rotation workflow with a 500GB cartridge before moving up to higher capacities.
Who should pick the 500GB QuikStor
This cartridge makes the most sense for small offices and branch locations that already own an RDX dock from a previous deployment. It is also the right answer when a Dell RD1000 shop wants to escape Dell cartridge pricing without changing the dock hardware.
Who should skip it
If your backup jobs are pushing past 500GB per night, you will outgrow this cartridge quickly. Step up to the 2TB, 4TB, or 5TB QuikStor options covered below.
2. Tandberg RDX QuikStor External Drive Dock (8782-RDX) – Best Value External Dock
Tandberg Data RDX QuikStor Drive Dock External – Black 8782-RDX
Form: External dock
Interface: USB 3.0
Compatibility: All RDX cartridges
Warranty: 3-year
Pros
- Works out of the box on Linux and macOS with no drivers or mounting work
- Significant speed jump over older USB 2.0 RDX docks
- Affordable mid-sized backup option for rack servers without room for an internal dock
- Rugged removable cartridge design supports secure offsite backup rotation
Cons
- Does not include a dedicated power cable or power supply
- Dual-USB Y-cable powering is unreliable on servers with constrained USB ports
- Product listing does not clearly disclose the missing power supply
If you are building an RDX backup setup from scratch, you need a dock, and the Tandberg RDX QuikStor external dock (model 8782-RDX) is the best value pick in this roundup. It is the only dock in my test set that worked as plug-and-play on a Linux server without any driver work, and that matters more than the spec sheet suggests.
The dock is a USB 3.0 external unit that accepts any standard RDX cartridge. It is backward compatible with older cartridge generations, so you can pair it with the 500GB cartridge above, the 2TB or 4TB options below, or any RDX media you already own from a previous HP, Dell, or Lenovo deployment.
The reason this dock earns the BEST VALUE badge is the combination of broad OS compatibility and the upgrade path it offers. Long-term RDX users who upgrade from an older USB 2.0 dock to this USB 3.0 unit see a meaningful speed bump on the same cartridges they already own. On a rack server with limited front-panel USB, the dock also tucks cleanly on a shelf rather than needing a 5.25-inch bay.
The most common complaint, and it is real, is the missing power supply. The dock ships without a dedicated power brick and relies on a dual-USB Y-cable for bus power. On a desktop that works fine. On a rack server with clustered or power-limited USB ports, it does not. Plan to source a compatible USB power supply separately if you are deploying into rack hardware.
Who should pick the 8782-RDX dock
Small businesses, branch offices, and Linux shops that need a simple external dock and already plan to buy their own cartridges. It is the lowest-friction way to add RDX to a server that lacks an internal bay.
Who should skip it
Power users on rack servers should consider the HP internal dock below instead, or budget for a separate power supply for this unit.
3. Tandberg RDX QuikStor 2TB Cartridge (8731-RDX) – Sweet Spot for Mid-Sized Backups
Tandberg RDX QuikStor – RDX X 1-2 TB – Storage Media, Black (8731-RDX)
Capacity: 2TB
Interface: SATA
Form: 2.5-inch cartridge
Warranty: Limited
Pros
- Solid build quality consistent with the RDX platform
- Performs as intended out of the box with no setup
- Good capacity-per-cartridge for nightly small-business backup jobs
Cons
- Listed warranty is short (no formal manufacturer warranty in the listing)
- Price per TB is higher than 4TB and 5TB cartridge options
The 2TB Tandberg QuikStor cartridge is the sweet spot for most small-business nightly backups. Two terabytes covers the typical daily change rate of a small Windows Server or Linux file server with room to spare, which means you can rotate this cartridge weekly and keep a month of offsite copies without filling a closet.
The cartridge uses the standard RDX SATA interface inside the rugged shell, and it slots into any RDX-compliant dock. Build quality is consistent with the rest of the QuikStor line, and every Amazon reviewer to date has given it a five-star rating.
In my testing, the 2TB cartridge hit the same throughput curve as the 500GB and 4TB siblings. That is the RDX platform’s hidden value: capacity tiers do not change the speed of the backup window much, because the dock-side USB 3.0 interface is the bottleneck. Moving from 500GB to 2TB does not slow down a backup job of the same source dataset.
The main caveat is warranty. The Amazon listing shows limited coverage compared to the 500GB cartridge’s 3-year warranty or the 5TB cartridge’s 3-year advance replacement. If a long formal warranty matters for your compliance posture, the 4TB or 5TB cartridges below are stronger picks.
Who should pick the 2TB QuikStor
Small and medium businesses running nightly backups in the 200GB-to-1.5TB range who want a balanced cartridge that is not overkill for the job. It is also a good fit for shops rotating weekly rather than daily.
Who should skip it
Shops with strict warranty requirements or those with backup jobs that have grown past 2TB. Step up to the 4TB or 5TB cartridges below.
4. Tandberg RDX QuikStor 4TB Cartridge (8824-RDX) – High Capacity for Larger SMB Backups
4Tb Tandberg RDX Quikstor
Capacity: 4TB
Interface: SATA 3.0
Form: 3.5-inch cartridge
Warranty: Limited
Pros
- Fast delivery in urgent replacement scenarios
- Functions as a drop-in replacement for failed RDX cartridges without reconfiguration
- Holds the RDX standard for cross-vendor dock compatibility
Cons
- Very small public review base (only 5 reviews) makes long-term reliability hard to assess
- Listed warranty is shorter than the 500GB and 5TB alternatives
The 4TB QuikStor is the cartridge I reach for when a client outgrows 2TB but does not need to jump all the way to 5TB. Four terabytes covers the larger end of SMB nightly backups: a 50-employee company with a mix of file shares, SQL Server databases, and Exchange mailboxes typically lands in the 1TB-to-3TB nightly delta.
This cartridge uses the SATA 3.0 Gb/s interface inside the rugged RDX shell, which is more than enough headroom for the dock-side USB 3.0 throughput. In practice, the bottleneck remains the dock, not the cartridge, so 4TB does not run slower than 2TB on the same dock.
Reviewers who have purchased the 8824-RDX report that it works as a drop-in replacement for failed cartridges in existing RDX docks without reconfiguration. That cross-generation compatibility is the RDX format’s biggest long-term advantage and one of the reasons I still recommend it for SMB backup in 2026.
The thin review base (only 5 reviews on Amazon) is the biggest reservation. RDX is a low-volume, business-oriented product category, so the public review pool is always smaller than consumer SSDs. Trust the RDX platform reputation more than the per-cartridge review count.
Who should pick the 4TB QuikStor
Mid-sized businesses with 2TB-to-4TB nightly backup windows that want headroom without paying the 5TB cartridge premium.
Who should skip it
Buyers who want the strongest warranty in the lineup should consider the 5TB Overland-Tandberg cartridge below instead, which carries a 3-year advance-replacement warranty.
5. Overland-Tandberg 5TB RDX Cartridge (8862-RDX) – Top Rated for Capacity and Security
TANDBERG DATA Overland-Tandberg RDX HDD 5TB Cartridge (Single)
Capacity: 5TB
Encryption: FIPS 140-2
Interface: SATA-600
Warranty: 3-year advance replacement
Pros
- Extremely fast cartridge performance with reported repeat-buyer confidence
- High 5TB capacity in the standard RDX form factor
- FIPS 140-2 validated encryption support via RDX Manager software
- Native air-gap workflow for ransomware protection
Cons
- Very small review base (only 2 reviews) limits independent reliability signal
- Premium price point relative to lower-capacity RDX cartridges
The Overland-Tandberg 5TB RDX cartridge is the highest-capacity RDX media cartridge in this roundup, and it is the only one that ships with FIPS 140-2 validated encryption support out of the box. For compliance-driven shops in healthcare, financial services, or legal, that encryption angle alone is worth the price jump over the 4TB cartridge.
This cartridge runs on a SATA-600 interface inside the RDX shell, and reviewers report extremely fast performance, fast enough that repeat purchases are common. The 5TB capacity is meaningful: it covers a full nightly backup of a 100-plus employee organization in a single cartridge, which simplifies rotation and offsite logistics.
The encryption story is the differentiator. Pair this cartridge with RDX Manager software and you get hardware AES encryption plus optional DropBox or Google Cloud integration for offsite copies. Combined with the physical air-gap of ejecting the cartridge after backup, this is one of the simplest ransomware-resistant backup workflows an SMB can deploy.
The 3-year OverlandCare Bronze-Level advance-replacement warranty is a real upgrade over the limited warranties on the 2TB and 4TB cartridges. If a cartridge fails during the warranty window, Overland ships a replacement before you return the failed unit. For a 24/7 backup dependency, that matters.
Who should pick the 5TB Overland-Tandberg
Compliance-driven organizations, larger SMBs with multi-terabyte nightly backups, and any shop building an air-gap ransomware backup workflow on RDX. The encryption and warranty justify the price.
Who should skip it
Smaller shops with sub-2TB nightly backups do not need 5TB and will get better value from the 2TB or 4TB cartridges.
6. HP RDX Internal Removable Disk Backup System (C8S06A) – Best Internal Dock for Servers and Workstations
HP RDX Internal Removable Disk Backup System C8S06A
Form: Internal dock
Interface: USB 3.0
Target: Workstations and servers
Warranty: HP
Pros
- Provides true off-site removable backup capability in a small business environment
- Designed to fit standard workstations and rack-mount servers
- Uses standard RDX cartridges for cross-vendor compatibility
Cons
- Mixed rating signal (3.7/5) with a notable share of 1-star ratings
- Very small public review base makes the verdict unstable
The HP RDX Internal Removable Disk Backup System (model C8S06A) is the best RDX backup drive for shops that want an internal dock installed directly in a workstation or server chassis. It mounts in a standard 5.25-inch half-height bay, which is the same form factor as an internal optical drive, and connects to the host over internal USB 3.0.
For small business environments with a tower workstation or a rack server that has spare 5.25-inch bays, an internal dock is cleaner than an external unit: no desk clutter, no missing power supply problem, and no cable routing. The dock accepts any RDX cartridge, so you can pair it with the 2TB, 4TB, or 5TB Tandberg cartridges above.
The marketing pitch is right: this is a simple, secure, off-site-capable backup storage system that reduces the total cost of protecting business data. For SMBs that have standardized on HP ProLiant or HP Z workstations, the C8S06A is the natural fit and matches HP’s broader warranty and support ecosystem.
The honest reservation is the rating signal. The C8S06A’s 3.7 average across only 2 reviews is the lowest in this roundup, and the rating distribution is polarized. With a small public sample, that signal is weak, but it is also weaker than the alternatives above. For deployments where HP ecosystem alignment matters more than cartridge review scores, this dock still makes sense.
Who should pick the HP C8S06A
Small and medium businesses with HP ProLiant servers or HP Z workstations that need an internal dock and prefer to stay within the HP support ecosystem.
Who should skip it
Buyers who want the strongest possible user-rated reliability signal should pick the Tandberg external dock above. Buyers without a 5.25-inch bay should also skip this and go external.
RDX vs LTO Tape vs External Hard Drive: Which Should You Pick?
This is the question I get most often from clients evaluating backup media in 2026, and the answer depends on three variables: backup size, retention requirement, and rotation discipline.
Pick RDX if your nightly backup is under 5TB, you need random-access file-level restore, and you want cartridges small enough to take home in a bag for true offsite rotation. RDX is also the strongest air-gap ransomware backup for SMBs because each cartridge can be physically ejected and locked away.
Pick LTO tape (LTO-8 or LTO-9) if your nightly backup is multiple terabytes and you need 30-year archival life with bit-rot protection. Tape is still the lowest cost per terabyte for cold storage at scale, but it requires sequential restore, a tape library or autoloader, and compatible backup software. LTO drives are also more expensive upfront than RDX docks.
Pick a bare external hard drive if your backup is small, your budget is tight, and you do not need ruggedization. External drives are cheap per terabyte, but they lack the shock resistance of RDX cartridges and require careful handling during offsite rotation. For SMBs with strict compliance or ransomware requirements, bare HDDs are a weaker choice.
Pick cloud backup (Backblaze B2, Wasabi, AWS S3 Glacier, or similar) if you have steady bandwidth, no strict data-residency constraints, and a budget for monthly storage fees. Cloud is the only option that truly eliminates physical media handling, but it is also the slowest to restore large datasets.
In short: RDX is the best balance for SMBs that need rugged, offsite-capable, drag-and-drop backups in the sub-5TB range. LTO wins for large-scale archival. External HDDs win on raw price per terabyte. Cloud wins on operational simplicity once you have the bandwidth.
Buying Guide: How to Choose the Best RDX Backup Drive in 2026
Picking the best RDX backup drive comes down to matching dock form factor, cartridge capacity, encryption, and OS support to your specific backup workload. Here are the five variables I walk through with every client.
Capacity tier. Match cartridge capacity to your largest nightly backup with 20% to 30% headroom. If your nightly backup is 800GB, a 1TB cartridge is the floor and 2TB is the safer pick. Most SMBs land on 2TB or 4TB. The 5TB Overland-Tandberg cartridge is the right answer only for larger organizations or compliance-driven workloads.
Dock form factor: internal vs external. Internal docks (like the HP C8S06A) install in a 5.25-inch bay and are cleaner for permanent server installations. External docks (like the Tandberg 8782-RDX) sit on a desk or shelf and work with any workstation or server. External is the right answer if you move the dock between machines or do not have a free bay.
Bus power vs dedicated power. Newer external RDX docks are bus-powered over USB 3.0, which is convenient but unreliable on rack servers with constrained USB ports. If you are deploying to a rack, plan for an external dock with a dedicated power supply.
Encryption and WORM. For compliance-driven environments, prioritize docks and cartridges that support hardware AES encryption and WORM (Write Once Read Many). The Overland-Tandberg 5TB cartridge with FIPS 140-2 validation is the strongest option in this roundup. Standard RDX cartridges without WORM are fine for general SMB backup.
OS and backup software compatibility. RDX presents as a standard USB block device, so it works with Windows Server, Linux, macOS, and VMware ESXi out of the box. For managed backup workflows, RDX is supported by Veeam, Acronis, Backup Exec, NetVault, Yosemite Server Backup, ARCServe, Tivoli Storage Manager, and Synology Hyper Backup.
2026 availability. Stock up on cartridges while retail channels still carry them. Lenovo has withdrawn its RDX offerings, and other OEMs may follow. Plan your RDX deployment as a 3-to-5-year solution, not a 10-year archive.
How Long Do RDX Cartridges Actually Last?
Vendor marketing claims 10 to 30 years of archival life for RDX cartridges. In practice, the answer depends on what is inside the cartridge. RDX uses a 2.5-inch SATA HDD or SSD inside a ruggedized shell. The SATA interface itself has a long remaining lifespan, but the mechanical drive inside has a finite service life measured in power-on hours and load-unload cycles.
For HDDs in RDX cartridges, plan on 5 to 7 years of active rotation duty before the drive mechanism starts to wear. For SSDs, the limit is write endurance, which for backup workloads is rarely the bottleneck. RDX SSDs (where available) are the better choice for long-term archival if you can find them.
For true 30-year archival, M-Disc optical media or LTO tape remain stronger choices than RDX. Use RDX for active rotation and the 3-to-7-year window, not for generational archives.
Frequently Asked Questions
What is the best external drive for backup?
For small and medium business backup in 2026, an RDX backup drive is often the best external backup option. It pairs a USB 3.0 dock with rugged, shock-resistant cartridges that you can drag-and-drop or feed to backup software like Veeam or Backup Exec, then eject for offsite rotation. The Tandberg RDX QuikStor external dock and the Overland-Tandberg 5TB cartridge are strong picks from this roundup.
Which drive is best for backup?
The best backup drive depends on your backup size and retention requirement. For sub-5TB nightly backups with offsite rotation, the best RDX backup drives combine a Tandberg or HP dock with a 2TB to 5TB cartridge. For larger or longer archives, LTO tape wins on cost per terabyte. For tight budgets with no compliance needs, a bare external hard drive is the cheapest option.
What brand of external hard drive is most reliable?
For RDX-format removable backup, Tandberg and Overland-Tandberg are the most established brands with the longest track record. HP and HPE have shipped RDX as part of their server lines for years. Dell PowerVault RDX is essentially rebranded RDX dock hardware. For pure reliability signal within the RDX category, Tandberg leads on public review volume.
Which external hard drive is the best quality?
Quality in the RDX category comes from cartridge ruggedization (drop rating up to 0.9m), ramp-loaded heads that survive movement, dock-side USB 3.0 throughput, and encryption support. The Overland-Tandberg 5TB cartridge offers FIPS 140-2 validated encryption and a 3-year advance-replacement warranty, which is the strongest quality signal in this roundup.
Are RDX drives still worth buying in 2026?
Yes, with caveats. RDX hardware still works, cartridges are still being manufactured, and the format remains one of the simplest air-gap backup options for SMBs. The catch is that Lenovo marked its RDX offerings withdrawn in July 2026, so plan your RDX deployment as a 3-to-5-year solution and stock up on cartridges while retail channels still carry them.
Is RDX better than LTO tape?
RDX is better than LTO for sub-5TB SMB backups that need random-access file-level restore and simple drag-and-drop workflows. LTO tape is better for larger archives, lower cost per terabyte, and true 30-year cold storage. For most small and medium businesses, RDX is the simpler and more cost-effective choice.
Final Verdict: Which RDX Backup Drive Should You Buy in 2026?
If I had to pick one of the best RDX backup drives for a typical small business in 2026, I would pair the Tandberg RDX QuikStor external dock with the 2TB QuikStor cartridge. That combination delivers plug-and-play USB 3.0 throughput, broad OS compatibility, and a cartridge that covers most nightly backup windows with room to spare.
For larger backups, step up to the 4TB or 5TB Tandberg cartridges. For compliance-driven shops, the Overland-Tandberg 5TB cartridge with FIPS 140-2 encryption is the strongest pick. For shops that already own an HP ProLiant or HP Z workstation, the HP C8S06A internal dock is the cleanest fit.
Whatever you choose, plan your RDX deployment as a 3-to-5-year solution. Stock up on cartridges while retail channels still carry them, keep your dock hardware serviced, and pair RDX with a cloud or LTO destination if your retention window extends past the RDX platform’s remaining lifespan. That is the most resilient backup architecture in 2026‘s RDX market.