What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
For a simple backup of one computer, an external hard drive is usually the easier choice: schedule backups, then disconnect the drive between sessions. Choose a NAS when you need a shared, always-available local destination for several devices. Neither option is a complete backup plan by itself: keep versioned copies and a separate off-site copy, and do not mistake RAID for backup.
NAS vs. external hard drive: the practical differences
| Decision | External hard drive | NAS |
|---|---|---|
| Typical role | A direct, removable local backup target for a computer. CISA recommends external drives for backing up data stored on devices. | A network-attached destination that can centralize backups and shared storage for multiple devices, depending on software and configuration. |
| Setup and upkeep | Generally the simpler category-level setup: connect it for backups, then disconnect it when finished. | Requires an enclosure, compatible drives, network and backup configuration, and ongoing management. |
| Access | Convenient for the computer it is connected to; it is not automatically available to other household devices. | Can be available over the home network to multiple devices, subject to setup and access controls. |
| Exposure while connected | A connected drive may be reachable by malware on the computer. Disconnecting it between backup sessions reduces that exposure. | A network-accessible NAS may be reachable from other devices. Use protected, versioned backups; RAID or snapshots alone are not a substitute for another recoverable copy. |
| Protection from a home-wide event | A drive stored at home may be lost in the same fire, disaster, or theft as the computer. | A NAS kept at home faces the same problem. Keep another copy off-site. |
| Price comparison | No current price comparison was established for this category. | No specific model or current price was verified; account for the enclosure, drives, and management effort. |
For guidance on local device backups and removable-drive security, see CISA’s advice on protecting data stored on devices. For a NAS, the right choice depends on how many devices need backup, the amount of data, recovery needs, and whether you will maintain the system.
As an Amazon Associate I earn from qualifying purchases.
When an external hard drive makes more sense
One computer and a straightforward routine
If you mainly need to back up one computer, a USB external hard drive is a straightforward local destination. Set a recurring backup schedule, keep versions so you can recover earlier files, and connect the drive only when needed. CISA advises frequent backups and recommends disconnecting an external drive when it is not actively being used, because ransomware could otherwise reach and corrupt or delete backups.
Choosing and protecting the drive
- Choose capacity based on the data you need to protect and how much backup history you want; there is no universal capacity recommendation here.
- Encrypt the drive or removable media and store recovery keys safely, as CISA recommends.
- Keep the drive somewhere separate from the computer when it is not connected. If both stay at home, this does not protect against a home-wide disaster.
When a NAS is worth the extra setup
Several devices or shared storage
A NAS can make sense when several household computers or devices need a shared, always-available local backup destination. It can also serve as shared storage, but shared access and file synchronization are not the same as an independently recoverable, versioned backup. Confirm that your devices and backup software support the workflow you intend to use.
#1 Best Overall
- IronWolf internal hard drives are the ideal solution for up to 8-bay, multi-user NAS environments craving powerhouse performance
- Store more and work faster with a NAS-optimized hard drive providing ultra-high capacity up to 16TB and cache of up to 256MB
- Purpose built for NAS enclosures, IronWolf delivers less wear and tear, little to no noise/vibration, no lags or down time, increased file-sharing performance, and much more
- Easily monitor the health of drives using the integrated IronWolf Health Management system and enjoy long-term reliability with 1M hours MTBF
- Three-year limited warranty protection plan included and three year Rescue Data Recovery Services included
RAID does not replace backup
RAID can help keep a system available after some drive failures, but it does not provide an independent backup copy. Synology warns that RAID crashes and hard-drive failures can still cause data loss. Accidental deletion, corruption, malware, or damage to the NAS can also affect the data it holds. Keep a separate backup, preferably with versions and at another location. See Synology’s NAS backup guidance.
Build a backup plan that survives more than a drive failure
Use 3-2-1 as a planning framework
The 3-2-1 approach means keeping three copies of important data, using two types of storage, and keeping one copy off-site. It is a practical way to think beyond a single device or location, not a guarantee of safety. A second copy in the same home can still be lost to fire, natural disaster, or theft. Synology explains the approach in its backup and data protection guidance.
Rank #2
- Store more, compute faster, and do it confidently with the proven reliability of BarraCuda internal hard drives
- Build a power house gaming computer or desktop setup with a variety of capacities and form factors
- The go to SATA hard drive solution for nearly every PC application from music to video to photo editing to PC gaming. Ax. Sustained transfer rate OD: 190MB/s
- Confidently rely on internal hard drive technology backed by 20 years of innovation
- Frustration Free Packaging - This is just an anti-static bag. No cables, no box.
Match the arrangement to your household
- One computer: Use a scheduled external-drive backup, disconnect the drive between sessions, and maintain another copy separately or with a suitable cloud backup.
- Several devices or shared household data: Use a NAS as a local destination if its setup and ongoing care are worthwhile, then back it up to a separate external drive stored elsewhere or to a suitable cloud destination.
- Either setup: Use backup software that retains versions and check that you can restore files. Syncing files between devices alone may also sync accidental deletion or corruption.
Cloud backup and NAS compatibility are not interchangeable
Cloud backup can provide the off-site copy, but check the service’s support for the device you intend to protect. Backblaze says its Computer Backup product does not support backing up network drives or NAS devices. Its B2 cloud storage can be used for NAS backups through supported applications, including Synology Cloud Sync and QNAP Hybrid Backup Sync 3. Those are distinct products and workflows; do not assume a computer-backup plan covers a NAS. See Backblaze’s network-drive support information and confirm current compatibility with your NAS and chosen service.
Free tools Windows power users keep installed
One-click scans. No signup required.
Quick Recap
Rank #4
- Available in capacities ranging from 2 to 22TB(1) | (1) 1GB = 1 billion bytes and 1TB = 1 trillion bytes. Actual user capacity may be less depending on operating environment.
- For RAID-optimized NAS systems with unlimited number of bays
- Rated for 550TB/yr workload rate(2) | (2) Annualized Workload Rate = TB transferred x (8760 / recorded power-on hours). The maximum rated workload is specified for operating at typical temperature of 40C. Workload Rate will vary depending on your hardware and software components and configurations.
- Designed to handle the demands of high-intensity 24x7 multi-user NAS environments
- Western Digital partners with a wide range of NAS system vendors for extensive testing to ensure compatibility with most NAS enclosures
Rank #3
- IronWolf internal hard drives are the ideal solution for up to 8-bay, multi-user NAS environments craving powerhouse performance.date transfer rate:6.0 gigabits_per_second
- Store more and work faster with a NAS-optimized hard drive providing 8TB and cache of up to 256MB
- Purpose built for NAS enclosures, IronWolf delivers less wear and tear, little to no noise/vibration, no lags or down time, increased file-sharing performance, and much more
- Easily monitor the health of drives using the integrated IronWolf Health Management system and enjoy long-term reliability with 1M hours MTBF
- Three-year limited product warranty protection plan and three year Rescue Data Recovery Services included
How to choose
- Count the devices. If one computer needs a local backup, start with an external drive. If multiple devices need a shared destination, consider a NAS.
- Decide how much availability you need. A removable drive is accessed when connected; a NAS can stay available on the network, which adds convenience but also requires configuration and management.
- Plan for recovery, not just storage. Choose a versioned backup method and make sure you can restore files; RAID and sync alone do not provide that protection.
- Choose an off-site copy. Keep it in a separate location or use a cloud option that explicitly supports the computer or NAS you are backing up.
- Make the routine sustainable. A backup that is not kept current will not protect recent changes. Set a schedule and periodically check that backups complete and files can be recovered.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
