Selection · compatibility · practical checks
NAS Buying Guide: Shared Files, RAID and Backups
A NAS can support shared files and backup workflows, but RAID alone is not a backup. Plan usable capacity, permissions, network speed and independently recoverable copies.
References: Synology backup and data protection; Synology NAS backup strategy; CISA ransomware prevention and response
Key selection and compatibility decisions
| Requirement | What to check | Limitation |
|---|---|---|
| RAID | Availability through supported disk-failure scenarios | It does not replace separate backups |
| Snapshots | Useful version/recovery feature where supported | Retention and deletion permissions still matter |
| Independent backup | Restore copies outside the live data’s failure path | Include isolated/off-site protection and testing |
| Network connection | Match NAS, switch and client capabilities | One faster port cannot remove every bottleneck |
Documentation behind these checks
References: Synology backup and data protection; Synology NAS backup strategy; CISA ransomware prevention and response
Before you choose
- Write down the task, applications and exact equipment already in use.
- Identify a supported configuration using the relevant manufacturer documentation and the checks above.
- Include required accessories, setup and data protection in the total cost.
- Obtain the exact specification, inclusions and applicable warranty or service terms in writing.
A practical example
Before replacing a system drive, identify its interface and physical format from the device documentation. Check source health and encryption, make a safe independent backup, and choose migration or a clean installation. A drive advertised as faster is useful only if the platform supports it.
Questions and answers
When is a NAS useful?
A NAS can provide shared storage and backup services for supported devices. Choose one around users, usable capacity, applications, network performance and recovery needs. It is not simply an external drive with Wi-Fi. Account for disks, backup destination, access permissions, maintenance and any additional software licences.
References: Synology NAS backup strategy; Synology backup and data protection; CISA ransomware prevention and response
Does RAID mean my data is backed up?
No. RAID can help availability through certain drive failures, depending on the configuration, but it does not replace an independent recoverable copy. Accidental deletion, ransomware, theft or wider system failure can still affect data. Plan separate backups and test recovery, including a suitably isolated or off-site copy.
References: Synology NAS backup strategy; Synology backup and data protection; CISA ransomware prevention and response
How many bays and how much capacity do I need?
Start with present files, growth, retention and the usable capacity after the chosen redundancy arrangement. Allow for snapshots, applications and expansion constraints. Check compatible drive models and replacement procedure for the NAS. Advertised raw disk capacity is not the same as the space available for users.
References: Synology NAS backup strategy; Synology backup and data protection; CISA ransomware prevention and response
Will a faster NAS automatically speed up file access?
No. Disks, RAID layout, network ports, switches, clients and application behaviour all contribute. A faster NAS port does not help fully if the rest of the path remains slower. Consider simultaneous users and small-file versus large-file workloads, then size the complete connection rather than one device.
References: Synology NAS backup strategy; Synology backup and data protection; CISA ransomware prevention and response
How should I protect shared files and remote access?
Give users only the access they need, keep software updated and use strong authentication. Expose remote services only through an appropriate supported design rather than casually opening management ports. Maintain backup retention and recovery information separately. Security features are useful only when they are configured, monitored and tested.
References: Synology NAS backup strategy; Synology backup and data protection; CISA ransomware prevention and response
What should a NAS quotation include?
Ask for NAS and disk models, usable-capacity assumptions, redundancy, backup destinations, network upgrades and any software licences. Clarify setup, migration, account permissions, restore testing and ongoing support. Provide users, file types, growth and recovery expectations so the storage plan can be assessed.
References: Synology NAS backup strategy; Synology backup and data protection; CISA ransomware prevention and response