If you are shopping for the best external drives for backup, the first mistake to avoid is paying for speed you do not need. For most UK buyers, backup is a capacity problem first and a speed problem second. That means the best buy is often the drive with the lowest £/TB, not the flashiest box or the newest USB standard.
That sounds simple, but external storage listings are full of traps. A 1TB portable SSD can look affordable until you compare it with an 8TB desktop hard drive on a price-per-terabyte basis. Equally, the cheapest external hard drive is not always the right backup drive if you move large photo libraries every day, travel with it, or need something tougher than a spinning disk in a plastic shell.
How to compare the best external drives for backup
For backup, there are four numbers that matter most: capacity, £/TB, transfer speed and form factor. Everything else is secondary until those are clear.
Capacity decides how long the drive will remain useful. If your laptop has 512GB of storage and you want versioned backups plus room for photos and phone dumps, a 1TB drive is usually too tight. In practice, 2TB is the minimum sensible starting point for lighter home use, while 4TB to 8TB tends to be the sweet spot for families, photographers and anyone backing up more than one machine.
£/TB is where the real value shows up. External hard drives usually win by a wide margin here, especially at 4TB, 5TB, 8TB and above. External SSDs are much faster, smaller and quieter, but their cost per terabyte is still significantly higher. If your backup runs overnight or in the background, paying double or triple per terabyte for SSD speed often makes little sense.
Speed matters when backup is frequent and manual. If you regularly copy hundreds of gigabytes of video, a portable SSD can save real time. If you mostly schedule automatic backups and leave the drive connected, an HDD is normally the more rational buy.
Form factor is the final filter. Portable drives are bus-powered and easier to move around. Desktop drives need mains power but usually offer more capacity and better £/TB. For a drive that sits beside a router, PC or home office monitor, desktop models are often the strongest value.
HDD or SSD for backup?
This is the decision most buyers actually need to make.
External hard drives
External HDDs are still the default choice for bulk backup because they offer the lowest price per terabyte. If your main goal is storing family photos, Windows backups, Time Machine archives, game captures or old project folders, HDDs remain hard to beat. They are slower, and they are more vulnerable to knocks while operating, but they stretch a budget much further.
For many UK shoppers, the best-value zone is portable 4TB to 5TB HDDs and desktop 8TB to 16TB HDDs. These capacities usually balance headline price against long-term usefulness better than entry-level 1TB or 2TB models.
External SSDs
External SSDs make sense when backup is part of your working day rather than a background chore. They are much faster for large transfers, nearly silent, and more resistant to drops. The trade-off is straightforward: you will pay far more per terabyte.
That means SSDs are often the better backup choice for photographers, video editors, commuters, and anyone carrying data between locations. For static home backup, they are usually a luxury rather than the best value.
The backup drive types that usually make the most sense
Best value for most people: 4TB to 5TB portable HDD
This is the part of the market where convenience and capacity meet. A 4TB or 5TB portable hard drive is small enough to put in a drawer, requires no separate power brick, and usually lands at a far better £/TB than smaller SSDs.
For a family laptop, student machine, PS5 media archive, or general household backup, this capacity range is often enough without pushing you into bulky desktop territory. It is also a safer buy than 1TB or 2TB if you expect your storage needs to grow.
The brands you will see most often are Seagate, Western Digital and Toshiba. At this size, the right choice is usually whichever reputable model is cheapest per terabyte on the day, provided the seller, condition and exact capacity are clear.
Best £/TB overall: 8TB+ desktop HDD
If the drive will live on a desk and back up one or more PCs, desktop external HDDs usually offer the best raw storage value. Once you move into 8TB, 10TB, 12TB and above, price-per-terabyte often improves sharply compared with portable options.
This is the sensible route for home offices, Plex libraries, photographers with large RAW archives, and anyone replacing a pile of older USB drives. The downsides are obvious: you need mains power, the unit is less portable, and the enclosure takes up more space. But for backup value, desktop HDDs are usually where the strongest deals sit.
Best for speed and portability: 2TB to 4TB external SSD
If you need a backup drive that is genuinely easy to carry, SSD is the cleaner option. A 2TB or 4TB external SSD is ideal if you work between home and office, back up camera footage on the move, or simply do not want to wait around for large copies.
The catch is that external SSD pricing can be misleading. A sale sticker on a 1TB model may still leave it poor value against a 4TB HDD. For backup buyers, SSDs make sense when the speed and durability benefits are worth the premium, not just because the listing says it is discounted.
What to watch for when comparing prices
The cheapest listing is not always the best buy. Capacity variants, third-party sellers and condition labels can distort the picture.
Refurbished or renewed drives can offer lower £/TB, but they are not the obvious first choice for primary backup unless the saving is meaningful and you already follow a proper multi-copy backup setup. If a drive will hold your only copy of family photos, buying purely on the lowest headline price is risky.
You also need to watch for old stock and odd capacities. Sometimes a 6TB model is priced so close to an 8TB alternative that the larger drive is clearly better value. This is exactly why price-per-terabyte matters more than sticker price alone.
Another common issue is overpaying for branding. Some rugged external SSDs are worth it if you travel or work outdoors, but plenty of buyers end up spending extra for rubber bumpers and marketing terms they will never use. For desk-based backup, plain enclosures often offer better value.
Which external backup drive suits which buyer?
If you want the safest mainstream recommendation, buy a 4TB or 5TB portable HDD from a major brand when the £/TB is competitive. It is the easiest answer for most households.
If your priority is pure storage value, move up to an 8TB or larger desktop HDD. This is usually the best answer for people backing up multiple devices or large media collections.
If you regularly move data and care about transfer time, buy an external SSD, but be realistic about capacity. A 2TB SSD is often a better buy than a 1TB model, while 4TB is where SSD becomes more useful for serious backup, albeit much more expensive.
If you back up a console, check compatibility and think about use case. For media and archived games, HDD value is hard to ignore. For active game storage where load times matter, SSD has a stronger case, though that becomes more than a simple backup purchase.
If you are backing up irreplaceable work, do not stop at one drive. The best external drive for backup is still only one copy. A cheap second drive or a second backup location often improves real-world protection more than upgrading from HDD to SSD.
Best external drives for backup: what usually offers the strongest value
The market changes daily, but the same patterns repeat. Portable HDDs win for affordable everyday backups. Desktop HDDs usually dominate on £/TB at higher capacities. External SSDs are best reserved for buyers who will actually benefit from the speed, size and shock resistance.
That is why comparison data matters more than brand loyalty. On one day, a Western Digital 5TB portable drive may be the clear value pick. On another, Seagate or Toshiba may undercut it enough to become the obvious choice. The smartest approach is to compare like for like - same capacity, same condition, same drive type - and then look at price per terabyte first.
That is also where a value-led site like TerabytePrices is useful. Instead of guessing from flashy sale banners, you can see which capacities and drive types are genuinely competitive and which are only pretending to be deals.
A good backup drive should feel boring after you buy it. It should hold enough data, cost a sensible amount per terabyte, and suit the way you actually back up your files. If a drive does that, it is probably a better purchase than the louder, faster, pricier option sitting next to it.