What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
The right external drive depends on what you want it to do. For a Photos library you open and edit, use a compatible drive dedicated to that library. For Time Machine, use a separate backup drive. Apple warns against storing a Photos library on a device used for Time Machine backups.
Choose the drive for its job
An external drive for Mac photos can serve as the home for your active Photos library, a Time Machine backup destination, or a separate archive. Those jobs have different requirements, and the active library and Time Machine backup should be on different devices.
As an Amazon Associate I earn from qualifying purchases.
- Active Photos library: Choose storage with enough room for the library and expected growth, and keep it connected whenever you want to open that library in Photos.
- Time Machine backup: Choose a separate, directly connected drive with room for backup history. Apple names USB and Thunderbolt as connection examples.
- Photo archive: An archive is a separate copy of files, not a substitute for a current backup of your Mac or active library.
The available product evidence supports choosing by role and compatibility, not naming a defensible ranked list of current models. Check the drive’s capacity, connection, and intended use before buying; no current model performance tests, prices, or regional availability are established here.
What to look for in a drive for a Mac Photos library
Use a compatible format
Apple says an external device for a Photos library should be formatted as APFS or Mac OS Extended (Journaled). See Apple’s instructions for moving your Photos library to save space on your Mac.
#1 Best Overall
- Easily store and access 2TB to content on the go with the Seagate Portable Drive, a USB external hard drive
- Designed to work with Windows or Mac computers, this external hard drive makes backup a snap just drag and drop
- To get set up, connect the portable hard drive to a computer for automatic recognition no software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
Avoid removable media and backup disks
Apple cautions against putting a Photos library on removable media such as an SD card or USB flash drive, and says not to use a device that serves as a Time Machine backup. A conventional external hard drive or SSD may suit a working library if it meets the format and connection requirements. Keep it available when Photos needs to open the library.
Size for the library and growth
For a library-only drive, allow space for the current library plus the growth you expect. Apple does not publish a minimum capacity for an active Photos library in the cited instructions, so this is a practical sizing judgment rather than an Apple minimum.
Rank #2
- 【Versatile Storage Expansion – For Gaming, Work & Everyday Use】 Running out of space on your PS5 or Xbox Series X/S? This external hard drive lets you store and play PS4 / Xbox One games directly, instantly freeing up your console’s internal storage for next‑gen titles. At the same time, it handles work file backups, media libraries, and cross‑device data transfers with ease. One drive, all your needs. *（Note: PS5 / Xbox Series X|S games cannot be run or stored directly from the external hard drive. However, by offloading your PS4 / Xbox One games, you can free up valuable space for newer titles.）*
- 【Patented Silicone Sleeve – Data Protection You Can Count On】 Worried about drops? We’ve got you covered. The patented built‑in silicone sleeve acts like a shock‑absorbing armor, cushioning your drive against bumps and falls. Whether it’s important work documents, precious family photos, or hard‑earned game saves, your data deserves this level of protection.
- 【Plug & Play, Compatible with Computers & Consoles】 No complicated setup—just plug in and go. Works seamlessly with Windows, Mac, and Linux computers, as well as PS4, PS5, Xbox One, and Xbox Series X/S. Process files at the office, back up data at home, or enjoy gaming in your downtime—one drive handles all your devices, simply and hassle‑free.
- 【USB 3.0 Ultra‑Fast Transfer – No More Waiting】 Tired of watching progress bars crawl? With USB 3.0 speeds up to 5Gbps, large files transfer in seconds. Whether you’re moving work documents, transferring hundreds of gigs of games, or backing up a year’s worth of photos, you get more done in less time.
- 【Sleek, Lightweight, and Ready to Go】 Weighing just 0.16 kg—lighter than a can of soda—this compact drive features a stylish mirror‑and‑frosted finish. Toss it in your bag and go, whether you’re heading to the office, visiting a friend for a gaming session, or giving a presentation on the road.
What to look for in an external drive for Time Machine
Check the connection and format
Time Machine can back up to directly connected external storage; Apple gives USB and Thunderbolt as examples. For a new backup disk, Apple prefers APFS or APFS Encrypted. See Apple’s guidance on backing up a Mac with Time Machine.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteLeave room for backup history
Apple’s July 6, 2026 Time Machine guidance says: “Use a storage device with at least twice the storage capacity of your Mac.” That recommendation applies to the Time Machine backup device, not to a drive used only for an active Photos library.
Rank #3
- 【Versatile Storage Expansion – For Gaming, Work & Everyday Use】 Running out of space on your PS5 or Xbox Series X/S? This external hard drive lets you store and play PS4 / Xbox One games directly, instantly freeing up your console’s internal storage for next‑gen titles. At the same time, it handles work file backups, media libraries, and cross‑device data transfers with ease. One drive, all your needs. *（Note: PS5 / Xbox Series X|S games cannot be run or stored directly from the external hard drive. However, by offloading your PS4 / Xbox One games, you can free up valuable space for newer titles.）*
- 【Patented Silicone Sleeve – Data Protection You Can Count On】 Worried about drops? We’ve got you covered. The patented built‑in silicone sleeve acts like a shock‑absorbing armor, cushioning your drive against bumps and falls. Whether it’s important work documents, precious family photos, or hard‑earned game saves, your data deserves this level of protection.
- 【Plug & Play, Compatible with Computers & Consoles】 No complicated setup—just plug in and go. Works seamlessly with Windows, Mac, and Linux computers, as well as PS4, PS5, Xbox One, and Xbox Series X/S. Process files at the office, back up data at home, or enjoy gaming in your downtime—one drive handles all your devices, simply and hassle‑free.
- 【USB 3.0 Ultra‑Fast Transfer – No More Waiting】 Tired of watching progress bars crawl? With USB 3.0 speeds up to 5Gbps, large files transfer in seconds. Whether you’re moving work documents, transferring hundreds of gigs of games, or backing up a year’s worth of photos, you get more done in less time.
- 【Sleek, Lightweight, and Ready to Go】 Weighing just 0.16 kg—lighter than a can of soda—this compact drive features a stylish mirror‑and‑frosted finish. Toss it in your bag and go, whether you’re heading to the office, visiting a friend for a gaming session, or giving a presentation on the road.
Back up the library, even if you use iCloud Photos
iCloud Photos is not a reason to skip a local backup. Apple says a local backup remains important and identifies Time Machine and manual copying as options. Keep a backup separate from the drive holding the active library.
Check for referenced files
Photos libraries may refer to originals stored outside the library, known as referenced files. Apple says those files are not automatically included when you back up the library. They also are not available through iCloud Photos; if their external location is disconnected, or the files are moved or renamed, Photos may no longer find them. Include those files in your backup plan as well. See Apple’s information about referenced files in Photos.
Quick Recap
Best Value
- High capacity in a small enclosure – The small, lightweight design offers up to 6TB* capacity, making WD Elements portable hard drives the ideal companion for consumers on the go.
- Plug-and-play expandability
- Vast capacities up to 6TB[1] to store your photos, videos, music, important documents and more
- SuperSpeed USB 3.2 Gen 1 (5Gbps)
Rank #4
- USB-C and USB 3.1 compatible.Specific uses: Business, personal
- Innovative style with refined metal cover
- Password protection with 256-bit AES hardware encryption
- Formatted for Mac
Set up an external Photos library
- Quit Photos, then connect the external drive to your Mac.
- Format the drive as APFS or Mac OS Extended (Journaled) if needed. Formatting erases the drive, so copy any files you want to keep elsewhere first.
- Move the Photos library to the external drive using Apple’s move-your-library instructions.
- If you use iCloud Photos, make the moved library the System Photo Library. Apple explains how in its Photos library guidance.
- Keep the drive connected when opening Photos with that library, and set up a separate local backup.
Buying checklist
- Decide whether the drive will hold the active Photos library, Time Machine backups, or archived files.
- Buy separate devices for an active Photos library and Time Machine backup.
- For a library drive, confirm APFS or Mac OS Extended (Journaled) compatibility and capacity for growth.
- For a Time Machine drive, confirm direct connection to your Mac, APFS or APFS Encrypted support, and capacity of at least twice your Mac’s storage capacity, following Apple’s recommendation.
- Confirm the connector works with your Mac’s available ports, and avoid removable media for the active library.
- Include referenced originals stored outside Photos’ library in your backup plan.
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.
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →
