Best Hard Drives for Backup
Backup storage is all about cost per terabyte, adequate capacity, and reliability. Whether you are backing up a home PC to a single external drive, building a NAS backup target, or setting up a cold-storage archive shelf, the ideal backup drive delivers the most usable terabytes for the least money without sacrificing data safety. Backup workloads are mostly sequential writes followed by long idle periods, so you do not need cutting-edge speed — you need capacity and trustworthiness.
Choosing a backup drive
For single-drive external backups, any reliable high-capacity HDD works — focus on price per TB. For NAS backup targets (Synology, QNAP, TrueNAS), NAS-rated drives add vibration tolerance and always-on firmware. For cold-storage archives that sit powered off most of the time, enterprise or refurbished datacenter drives offer the highest density at the lowest cost. In all cases, a backup drive does not need to be fast — it needs to be big and reliable.
Quick Verdict
- Who this is for
- Anyone building a backup target — home PC users, NAS owners backing up to a second volume, and cold-storage archivists who need maximum capacity at minimum cost.
- What usually wins
- The cheapest new drive at 8 TB or above for simple backups. A NAS-rated drive if your backup target runs 24/7 in a multi-bay enclosure. Refurbished enterprise pulls for cold-storage shelves where cost matters most.
- Prioritise
- Capacity and price per TB above all else. Backup workloads are write-once, read-rarely — raw speed and premium features matter less than having enough room and keeping costs low.
Prices updated hourly from Amazon US and UK. All links go directly to the retailer. Details.
Best Overall Backup Value
The cheapest new high-capacity drives available, ranked by price per terabyte. Great for any backup use case where you want the most storage for the least money.
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Seagate IronWolf ST4000VN008 4TB Internal Hard Drive, NAS HDD, 3.5 Inch, 5900 rpm, CMR, 64 MB Cache, SATA 6 GB/s, Silver, 3 Years Data Rescue Service
ModusTech External (DESKTOP) Hard Drive 3TB USB 3.0 & Type-C 3.0 - High-Speed Data Storage for PC, Mac, Laptops, and Gaming Consoles - Durable Design, Compatible with Windows, MacOS, Linux (16.0, TB)
ModusTech External (DESKTOP) Hard Drive USB 3.1 Type-C - High-Speed Data Storage for PC, Mac, Laptops, and Gaming Consoles - Durable Design, Compatible with Windows, MacOS, Linux (14.0, TB)
Seagate Exos 7E8 HDD 512E/4KN SAS
ModusTech 12TB External (DESKTOP) Hard Drive USB 3.1 Type-C - High-Speed Data Storage for PC, Mac, Laptops, and Gaming Consoles - Durable Design, Compatible with Windows, MacOS, Linux (TB)
WD Purple SATA - Festplatte - Serial ATA (WD34PURZ)
Seagate Expansion Desktop External 16TB
High-Capacity Archive Drives (12 TB+)
Large drives for archiving media libraries, server images, and long-term data. More capacity per drive means fewer drives to manage and less shelf space needed.
Seagate IronWolf ST4000VN008 4TB Internal Hard Drive, NAS HDD, 3.5 Inch, 5900 rpm, CMR, 64 MB Cache, SATA 6 GB/s, Silver, 3 Years Data Rescue Service
ModusTech External (DESKTOP) Hard Drive 3TB USB 3.0 & Type-C 3.0 - High-Speed Data Storage for PC, Mac, Laptops, and Gaming Consoles - Durable Design, Compatible with Windows, MacOS, Linux (16.0, TB)
ModusTech External (DESKTOP) Hard Drive USB 3.1 Type-C - High-Speed Data Storage for PC, Mac, Laptops, and Gaming Consoles - Durable Design, Compatible with Windows, MacOS, Linux (14.0, TB)
ModusTech 12TB External (DESKTOP) Hard Drive USB 3.1 Type-C - High-Speed Data Storage for PC, Mac, Laptops, and Gaming Consoles - Durable Design, Compatible with Windows, MacOS, Linux (TB)
Seagate Expansion Desktop External 16TB
MDD MAXDIGITALDATA MDD 18TB 7200RPM 256MB Cache SAS 12.0Gb/s 3.5inch Internal Enterprise Hard Drive (MDD18TSAS25672E) - [Not a SATA HDD]
WD 18TB Elements Desktop External Hard Drive - USB 3.0, Black
Avolusion PRO-G1 Series 14TB USB 3.2 Gen 2 (10Gbps) USB-C External Hard Drive for Windows or MacOS Desktop PC/Laptop (Silver)
NAS Backup Drives
IronWolf and WD Red drives for NAS-based backup targets. NAS firmware handles always-on operation, RAID arrays, and multi-drive enclosures — ideal if your backup destination is a Synology, QNAP, or Unraid box.
Why this matters: If your backup target is a NAS running 24/7, NAS-rated drives are worth the modest premium. They include vibration tolerance for multi-bay enclosures, error recovery tuning for RAID, and firmware optimised for continuous operation. For a powered-off external drive, standard drives work fine.
Seagate IronWolf ST4000VN008 4TB Internal Hard Drive, NAS HDD, 3.5 Inch, 5900 rpm, CMR, 64 MB Cache, SATA 6 GB/s, Silver, 3 Years Data Rescue Service
WD Red Pro 3.0"" SATA 6Gb/s 10TB 7200rpm HDD
WD Red Plus 8TB NAS 3.5" Internal Hard Drive - 5640 RPM Class, SATA 6 Gb/s, CMR, 128MB Cache
Seagate IronWolf 14TB NAS Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 7200 RPM 256MB Cache for RAID Network Attached Storage (ST14000VN0008)
Seagate IronWolf 12TB, NAS, Internal Hard Drive, CMR, 3.5 Inch, SATA, 6GB/s, 7.200 RPM, 256MB Cache, for RAID Network Attached Storage, Data Rescue Services, FFP (ST12000VNZ008)
Seagate IronWolf Pro, 14 TB, NAS Internal Hard Drive, CMR 3.5 Inch, SATA 6 Gb/s 7,200 RPM, 256 MB Cache, for RAID Network Attached Storage, 3 years Rescue Services, FFP (ST14000NE0008)
Seagate IronWolf Pro, 14 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage, 3 year Rescue Services (ST14000NT001)
Seagate IronWolf Pro 14 TB NAS RAID Internal Hard Drive - 7,200 RPM SATA 6 Gb/s 3.5-inch (ST14000NE0008)
Refurbished Drives for Budget Backups
Used enterprise drives at 40-60% less than new retail. Excellent for bulk backup and cold-storage archives where brand-new warranty is not essential. These datacenter pulls are designed for millions of hours of operation.
ModusTech External (DESKTOP) Hard Drive 3TB USB 3.0 & Type-C 3.0 - High-Speed Data Storage for PC, Mac, Laptops, and Gaming Consoles - Durable Design, Compatible with Windows, MacOS, Linux (16.0, TB)
MDD MAXDIGITALDATA X18 MACH.2 (Dual Actuator) 18TB 7200RPM SAS 12Gb/s 512MB Cache 3.5-Inch Enterprise Hard Drive (MDD18TSAS51272E-2X18) - [Not a SATA HDD] (Renewed)
HEWLETT PACKARD HUH728080AL5204-HPE 8TB 7.2K 12G LFF SAS Hard Drive
Western Digital HDD Gold 18 TB SATA 512 MB 3.5 Inch
BUFFALO Replacement Spare Hard Drive 8TB NAS-Grade for TeraStation 2/4/8 Bay (OP-HD8.0N)
MDD MAXDIGITALDATA MDD (MD14TSAS25672E-2X14) 14TB 7200RPM 256MB Cache 4KN SAS 12Gb/s 3.5-inch (Dual Actuator) Enterprise Hard Drive - [NOT a SATA HDD] (Renewed)
Seagate Expansion Desktop 20TB, External Hard Drive, USB 3.0, Data Rescue Services (STKP20000400)
Seagate Exos 26TB Internal Hard Drive, 3.5 Inch HDD, SATA3, 256MB Cache (Renewed)
How to Choose
Backup drives sit at the intersection of capacity, cost, and just-enough reliability. Here is how to pick the right one.
Capacity first
Your backup drive should be at least as large as the data set you are protecting — ideally larger to allow growth. At 8 TB and above, per-TB pricing improves significantly. Buy the largest drive your budget allows.
Price per TB
Backup storage is cost-sensitive. Compare drives on a per-TB basis rather than sticker price. A higher total price on a larger drive often delivers a lower cost per terabyte.
New vs refurbished
New drives include manufacturer warranties and known-good health. Refurbished enterprise pulls cost 40–60% less and work well for backup — especially cold-storage archives where the drive is powered off between backup runs. Both are valid depending on your budget and risk tolerance.
NAS vs single-drive use
If your backup target is a NAS running 24/7, use NAS-rated drives (IronWolf, WD Red Plus) for vibration tolerance and always-on firmware. For a single external drive or a powered-off shelf drive, any standard HDD is fine.
Frequently Asked Questions
How long can a hard drive store data without power?
Modern HDDs can retain data for years without power — magnetic storage is non-volatile. However, mechanical components can seize after extended disuse. For long-term archival, power on backup drives every 6–12 months to keep bearings lubricated and verify data integrity.
Is an external or internal hard drive better for backup?
External drives are simpler — plug in via USB, run your backup, unplug and store offsite. Internal drives in a NAS allow automated scheduled backups over the network. For the 3-2-1 rule (3 copies, 2 media types, 1 offsite), having at least one external drive you can store offsite is ideal.
How much storage do I need for backups?
Plan for at least 2x your current data. If you have 2 TB of files, a 4 TB backup drive gives room for versioned backups and growth. For Time Machine or Windows File History, 2–3x your source data is recommended since these tools keep file history over time.
Do I need an enterprise drive for backups?
No. Backup workloads are typically infrequent, large sequential writes — any consumer or NAS drive handles this fine. Enterprise drives are built for 24/7 heavy workloads, which is overkill for a drive that runs a backup once a day. Buy refurbished enterprise drives if you want the build quality at consumer prices.
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