Laptop owners running out of space
An external drive can hold local files, but decide whether you are moving files to free space or making a second copy. For longer-term computer-file backup, Which? distinguishes HDDs from the faster SSD option.
Who is each route for?
People protecting photos and documents
If a file would be hard to recreate, plan how to restore it after the laptop or its contents become inaccessible. The National Cyber Security Centre defines a backup as a copy kept in a separate safe location.
People using files on several devices
Cloud folder syncing can make selected files available beyond the original computer. Check that the folders you need are enabled and that their contents fit within the account allowance.
What should you check before choosing?
Start with the job: freeing laptop space, keeping a restorable copy and reaching files on other devices are related needs, but they are not the same thing.
| Priority | What to check | Your needs |
|---|---|---|
| Recoverable copies | Choose a destination separate from the original files. Set up the backup, then check that you can locate and restore a file; the National Cyber Security Centre defines a backup by its separate location and ability to be restored. | I cannot replace some of these photos or documents, so moving the only copy off my laptop would not solve the problem. |
| Capacity | Compare the files to be stored with the available drive or cloud space. Apple recommends a Time Machine drive with at least twice the Mac’s storage capacity; Google says its account storage is shared across Gmail, Drive and Photos. | My files need room now, and I want enough space for continuing backups rather than a destination that fills straight away. |
| Transfer and travel | Check the laptop port, drive connector and cable. Which? describes SSDs as faster than HDDs, while Samsung says the T7 Shield’s claimed maximum speeds require a USB 3.2 Gen 2 host and cable with UASP enabled. | I move large photo or video folders regularly, or carry the drive with my laptop; otherwise, local backup capacity matters more to me than transfer speed. |
| Access across devices | Check which folders the cloud service syncs, whether uploads have completed and what else uses the allowance. Microsoft documents cross-device access for folders configured through OneDrive backup. | I want selected files on another device, while still knowing which separate copy I could restore if the original becomes inaccessible. |
What can go wrong with a backup plan?
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Assuming extra storage is already a backup
A file moved from a full laptop to its only remaining copy on a drive still depends on that drive. A synced folder also needs its contents and recovery options checked before you rely on it.
Identify the files you cannot recreate, keep a copy in a separate safe location and try restoring a file.
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Overlooking drive setup
A drive must be configured as the backup destination, not merely plugged in. Microsoft File History uses a selected external drive or network location, while a Mac owner should check the drive’s format and Time Machine setup.
Check the operating system, connector and existing files on the drive before approving any erase or reformat step. Copy files you need to keep elsewhere first.
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Choosing an SSD by its headline speed alone
Samsung conditions the T7 Shield’s claimed maximum sequential speeds on USB 3.2 Gen 2 host and cable support with UASP enabled. A laptop or cable that does not meet those conditions changes the relevance of that claim.
Check the actual laptop port and cable specification, then decide whether frequent large transfers justify prioritising an SSD over an HDD for local backup.
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Letting a backup disk run short of space
A disk also needs capacity for continuing backups, not just the files you can see today. Apple recommends at least twice the Mac’s storage capacity for a Time Machine drive.
Size the destination for the computer and expected file growth, and check periodically that backups are completing.
Which brands are relevant?
Western Digital
Western Digital’s My Passport and My Book lines appear in PCMag UK’s September 2026 external-drive roundup for portable and desktop HDD use respectively.
- The two named lines address different carrying and desk-based storage needs.
- Check the exact model’s connector, capacity and backup setup; a mention of one model does not establish compatibility for the whole range.
Seagate
Seagate is another external-HDD reference in PCMag UK’s September 2026 scenario-based roundup.
- Its external-drive range is relevant when considering a local HDD destination.
- Confirm the exact model’s capacity, power and connection requirements rather than treating the brand name as a backup configuration.
Samsung
Samsung’s T7 and T7 Shield are portable SSD lines. Samsung UK lists USB 3.2 Gen 2 specifications for them.
- The T7 Shield has a manufacturer-claimed sequential read speed of up to 1,050 MB/s and write speed of up to 1,000 MB/s under Samsung’s stated conditions.
- Those T7 Shield maximums require a USB 3.2 Gen 2 host and cable with UASP enabled; check the exact variant and laptop before using the claim to decide.
Joybuy external-drive options
These HDDs and portable SSDs are options for local laptop storage or a separately configured local backup. Choose a capacity and connection that fit your computer, then set up and check the copies you intend to keep.
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Western Digital My Passport Ultra 4TB, Silver
Consider this portable HDD for a sizeable local copy of laptop files when transfer speed is secondary. Its stated capacity is 4TB; check the connection and operating-system setup, and keep another recoverable copy of files you cannot replace.
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Samsung Portable SSD T7 4TB USB Type-C, Grey
This portable SSD is a local-storage option if you regularly move large photo or video folders. The title specifies 4TB and USB 3.2 Gen 2; check your laptop port and cable, and arrange a separate recoverable copy for important files.
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Western Digital My Passport 2TB, Black
Consider this portable HDD for local copies when 2TB fits the files you plan to store. Check the connection and your operating-system setup before configuring backups; retain another recoverable copy of irreplaceable files.
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SanDisk Portable SSD 2TB
This 2TB portable SSD is an option for carrying local files between places. Confirm its connector and setup requirements for your laptop, and do not make a single carried drive the only copy of important photos or documents.
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Samsung MU-PE1T0S 1TB USB Type-C, Black
Consider this portable SSD if 1TB covers the files you intend to carry or copy locally. Its title specifies USB 3.2 Gen 2; check laptop and cable compatibility, and set up a separate recoverable copy for irreplaceable files.
Backup questions answered
Is moving files off a full laptop the same as backing them up?
No. Moving the only copy to an external drive can free laptop space, but that drive then holds the only copy. The National Cyber Security Centre defines a backup as a copy kept in a separate safe location that can be restored if access to the original is lost.
Can a Windows laptop back up to an external drive automatically?
Yes. Microsoft says File History can regularly save copies of personal files to a selected external drive or network location. Configure the destination and check that backups are taking place.
How large should a Mac Time Machine drive be?
Apple recommends an external device with at least twice the Mac’s storage capacity for Time Machine backups. Check the drive’s format and any files already on it before approving setup steps that erase or reformat it.
Is a cloud allowance reserved for laptop files?
Not necessarily. Google says Google Account storage is shared across Gmail, Google Drive and Google Photos. Check total account use as well as the folders you intend to upload or sync.
Will a portable SSD reach its advertised transfer speed?
Not on every laptop. Samsung says the T7 Shield’s claimed maximum sequential speeds require a USB 3.2 Gen 2-capable host and cable with UASP enabled. Check those conditions for the exact drive and computer rather than treating the headline figure as a guaranteed result.