Every business runs on data: customer records, invoices, contracts, project files and email archives. Losing that data – through a hardware failure, a ransomware attack or simple human error – can stop day-to-day operations within hours. Yet many small and medium-sized businesses still rely on a single external drive or assume that cloud sync services are a complete backup.
A reliable backup strategy starts with the right hardware. Three technologies dominate the business market: NAS systems, RDX removable disk systems and LTO tape drives. Each has clear strengths, and each suits a different company size and data volume.
In this article, we explain how NAS, RDX and LTO work, compare their key features and show which backup hardware is the right fit for your business – from a five-person office to a growing mid-sized company.
Why Dedicated Backup Hardware Still Matters
Cloud services play an important role in modern IT, but they do not replace a local backup. Restoring several terabytes over an internet connection can take days, and a sync service will happily replicate deleted or encrypted files.
A proven guideline is the 3-2-1 backup rule:
3 copies of your data (the original plus two backups)
2 different storage media
1 copy stored off-site or offline
The offline copy is especially important today. Ransomware often targets every storage device it can reach on the network – including connected backup drives. A backup medium that is physically disconnected (an "air gap") cannot be encrypted by an attacker.
This is exactly where the choice between NAS, RDX and LTO becomes relevant: the technologies differ in speed, capacity, cost and how easily they support offline storage.
Strengths of NAS
Fast backups and restores: Data is available on the network immediately – ideal for recovering individual files or entire systems quickly.
Automation: Backups of PCs, laptops, servers and virtual machines can run on a schedule without manual intervention.
Versatility: Many NAS systems also serve as file servers, support snapshots and can replicate data to a second NAS or to the cloud.
Scalability: Capacity grows by adding or upgrading drives or expansion units.
Limitations to consider
A NAS is permanently online, which makes it a potential ransomware target if it is not properly secured.
On its own, a NAS does not meet the off-site or offline requirement of the 3-2-1 rule.
Best suited for: the primary backup target in almost every business, combined with a second, offline medium.
Strengths of RDX
Easy to use: Cartridges are swapped like a USB stick and require no specialist knowledge.
Offline and portable: A removed cartridge is physically disconnected from the network and can be taken off-site, for example in a rotation of daily or weekly cartridges.
Robust media: Cartridges are designed for frequent handling, transport and long-term storage.
Fast random access: Because RDX is disk-based, individual files can be restored quickly.
Limitations to consider
Capacity per cartridge is limited compared with LTO tape, so RDX becomes less practical as data volumes grow.
The cost per terabyte is higher than with tape.
A reliable cartridge rotation depends on someone actually swapping the media.
Best suited for: small offices and branch locations that need a simple, offline second copy of their data.
Strengths of LTO
Very low cost per terabyte: Once the drive is in place, additional capacity is simply a matter of adding cartridges.
Natural air gap: Cartridges stored on a shelf or in a safe are completely offline and protected from ransomware.
Long shelf life: Tape is designed for archiving over many years, which supports retention requirements.
Data security features: LTO supports hardware encryption and WORM (Write Once, Read Many) media for tamper-proof archives.
Scalability: Tape autoloaders and libraries automate cartridge handling as data volumes grow.
Limitations to consider
Higher initial investment for the drive or library.
Data is read sequentially, so restoring individual files takes longer than from disk.
Backup software and processes require more IT know-how.
Best suited for: businesses with large or fast-growing data volumes, strict retention requirements or a need for long-term archiving.
NAS, RDX and LTO at a Glance
The Right Fit by Company Size
There is no single best backup technology. The right choice depends mainly on your data volume, your IT resources and your requirements for retention and recovery time. The following recommendations offer a practical starting point.
Practical Tips Before You Invest
Calculate your data volume and growth: Plan capacity for at least the next three to five years, including multiple backup versions.
Define recovery goals: How quickly must systems be running again after an incident, and how much data loss is acceptable? These answers determine how much fast disk storage you need.
Check software compatibility: Make sure your backup software supports the chosen hardware, your servers and any virtualisation platform.
Secure the NAS: Use separate admin accounts, multi-factor authentication, regular firmware updates and immutable snapshots where available.
Test your restores: A backup is only as good as its last successful restore. Schedule regular restore tests.
Store offline media safely: Keep RDX cartridges or LTO tapes in a secure, separate location – ideally fireproof and off-site.
Conclusion: Combine Technologies for a Resilient Backup
NAS, RDX and LTO are not competing technologies – they complement each other. A NAS delivers fast, automated backups and quick restores. RDX adds a simple offline copy that suits small offices. LTO tape provides high capacity, a low cost per terabyte and secure long-term archiving for growing businesses.
For most SMBs, the best approach is a combination: fast disk-based backups for everyday recovery and an offline medium that protects against ransomware and disasters. By matching your backup hardware to your company size and data volume, you build an IT infrastructure that keeps your business running – whatever happens.