Choose an external hard drive for a large local copy that mostly stays at home, or a portable SSD when frequent large transfers and carrying the drive matter. A desktop drive suits a growing fixed archive, while an off-site or cloud copy helps protect files from an incident affecting both the computer and the home; whichever route you choose, set up regular backups and test that files can be restored.
You have years of family photos, scans and documents on one computer and need a separate copy that can grow with the collection. A desktop HDD or high-capacity portable HDD can provide local storage; keep another copy away from the home for risks affecting the property. UK cyber-security guidance from the National Cyber Security Centre and NI Cyber Security Centre supports keeping backup copies in separate locations.
You need to back up a laptop but may carry the drive between rooms, homes or computers. A portable HDD can prioritise capacity in a compact format, while a portable SSD is more relevant when large transfers and a travel-oriented design matter. Samsung UK and Seagate UK provide model-specific specifications for these routes.
You need to move ordinary files between Windows and Mac computers, or need a dedicated Mac Time Machine disk. Apple Support identifies ExFAT as a Windows-compatible format for shared data disks, while APFS or APFS Encrypted is preferred for a Time Machine backup disk.
Start with the files you need to protect and how often they change, then check capacity, connection and the backup routine before choosing a drive.
| Priority | What to check | Your needs |
|---|---|---|
| Recoverable backups | Choose a destination separate from the computer; set up a schedule where available; restore a sample file or folder after setup. | I want recent photos and documents to be available after a computer failure, accidental deletion or malware incident. |
| Capacity | Measure the folders you plan to protect before buying; allow room for future files and backup history. For a dedicated Mac Time Machine disk, Apple advises at least twice the Mac's storage capacity. | My archive needs room to grow, and I do not want a new drive to fill immediately. |
| Connection and format | Check the computer port and supplied cable; confirm whether the disk is for shared Windows/Mac files or dedicated Time Machine use. Reformatting erases stored files. | I need the drive to connect without an unexpected adapter and fit the way our household uses Windows or Mac computers. |
| Portability and transfer routine | Choose a portable HDD for a sizeable local archive that may move occasionally, a portable SSD for repeated large transfers, or a desktop drive for a fixed home archive. Confirm any quoted SSD speed against the host and cable conditions. | I want storage that matches how often I transfer files and whether the drive will stay beside one computer or travel with me. |
A local drive can be lost, stolen, damaged or destroyed in the same incident as the computer. It can also be affected by malware if it remains connected beside the computer.
Keep a separate off-site or cloud copy of irreplaceable files. The National Cyber Security Centre and NI Cyber Security Centre recommend keeping important backup data separate from the main device and location.
A drive copied months ago may not contain recent photos, documents or earlier file versions when the computer fails.
Use File History, Time Machine, cloud backup or a scheduled backup application where appropriate, then restore a sample file to check the process works.
Formatting a disk or volume erases its files. Changing from a shared Windows/Mac data disk to a dedicated Time Machine disk may require reformatting.
Copy existing files to another verified location before changing the format, then decide whether the drive is for shared files or dedicated Time Machine backups.
Formatting without another copy can result in the loss of files already stored on the drive.
Maximum SSD performance depends on the computer, connection cable and supported USB mode. A connector shape does not confirm the transfer speed you will receive.
Check the computer port, supplied cable and the manufacturer's conditions for quoted speeds before paying more for a faster SSD.
Relevant for portable external hard drives for household backups, including the Expansion Portable line. Seagate UK lists 2TB, 4TB and 5TB variants, including the 5TB STKM5000400.
Relevant for portable SSD backup when quicker transfers and a compact, travel-oriented drive are important. Samsung's UK T7 Shield 4TB is one model-specific example.
Relevant for fixed-location desktop backup storage, including the My Book line for households with a large photo, video and document archive.
These Joybuy options cover portable hard drives and portable SSDs for creating a separate local copy of household photos and documents.
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A portable local-copy option for a growing household photo and document archive.
Stated 5TB capacity, USB-C connectivity and a USB-C-to-USB-A adapter. The listing states that backup software can be configured for scheduled local backups.
It is pre-formatted for Windows; Mac use requires reformatting, which erases existing content. Keep another copy away from the home for off-site protection.
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Consider this portable SSD when you regularly move large photo collections between computers.
Stated 4TB capacity, USB 3.2 Gen 2, up to 1,050MB/s read and 1,000MB/s write, with USB-C-to-C and USB-C-to-A cables.
Its maximum speeds depend on a compatible USB 3.2 Gen 2 host and cable. Confirm the file-system setup before using it for a dedicated Mac Time Machine workflow.
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A portable option for households moving files across computers and compatible Type-C devices.
Stated 2TB capacity, USB 3.2 Gen 2, up to 1,050MB/s read and 1,000MB/s write, plus USB-C-to-C and USB-A-to-USB-C cables.
Confirm the exact phone, tablet, operating system and file-management workflow before treating it as a direct mobile backup destination. Formatting may be needed for the intended system.
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A compact local-storage choice for carrying a photo and document backup between computers.
Stated 2TB capacity, up to 800MB/s read speed, a USB cable and 2-metre drop protection.
Check the supplied connector, cable standard and file system against your computer before buying or formatting. Maintain a separate off-site or cloud copy for important files.
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A high-capacity portable hard-drive option for periodic laptop or desktop backups.
Stated 4TB capacity, USB 3.2 Gen 1/USB 3.0 connectivity, a Micro-B drive connector and an included USB-A cable.
It is stated to be recognised automatically by Windows 10+; Mac users may need to reformat it. Set up a backup schedule and keep an additional off-site copy of irreplaceable files.
For a dedicated Time Machine disk, Apple advises using storage with at least twice your Mac's storage capacity. This guidance is specific to Time Machine rather than manually copied folders, and Apple recommends using the Time Machine disk only for Time Machine backups.
Yes, for ordinary shared file storage, provided you use a suitable format. Apple Support identifies ExFAT as a Windows-compatible choice for disks over 32GB; copy files elsewhere first because formatting erases the disk. A shared Windows-formatted disk is not a dedicated Time Machine disk without reformatting.
It can create a separate copy, but it only reflects the time you last copied the files and relies on you repeating the task. Windows File History can regularly back up selected libraries to an external drive or network location, while Time Machine can make Mac backups automatically after setup.
Leave it connected when an automated backup system needs access, but disconnect it when a backup is not being performed if your routine allows. The NI Cyber Security Centre advises this to reduce the risk of the backup being stolen or damaged with the computer.
Cloud backup can provide a separate-location copy and can be automated, but it does not necessarily replace the convenience of a local restore copy. UK cyber-security guidance notes that an online backup can remain unaffected if an external drive is destroyed in a fire, so a local-and-off-site arrangement is useful for important files.