Best Drives for Time Machine Backup
Time Machine is the built-in macOS backup solution and it works with any external drive. The question is whether to use an HDD (cheap, high capacity) or an SSD (fast, silent, compact). This page ranks both options by price per terabyte so you can choose the right backup drive for your Mac.
HDD vs SSD for Time Machine
An external HDD gives you 4–5 TB for the price of a 1 TB SSD. Since Time Machine backups are mostly sequential writes, HDDs perform well enough. SSDs are faster for initial backups and file restores, silent, and more portable. For a desktop Mac with a permanent backup drive, an HDD is the better value. For a MacBook that needs a travel-friendly backup drive, an SSD makes more sense.
Quick Verdict
- Who this is for
- Mac users who want reliable Time Machine backups — whether for a desktop Mac with always-connected storage or a MacBook with an occasional-connect portable drive.
- What usually wins
- A 2–4 TB external HDD for desktop Macs (best value). A 1–2 TB portable SSD for MacBooks (best portability). Apple recommends 2–3x your Mac internal storage for Time Machine.
- Prioritise
- Capacity at the lowest price per TB. Apple recommends your backup drive be 2–3x the size of your Mac internal storage to keep sufficient backup history.
Prices updated hourly from Amazon US and UK. All links go directly to the retailer. Details.
Best External HDDs for Time Machine
High-capacity external hard drives at the lowest cost per TB — maximum backup history for your Mac.
Portable SSDs for Time Machine
Fast, compact external SSDs for MacBook owners who want a portable backup drive.
How to Choose
Time Machine is simple but the backup drive choice matters for longevity and convenience.
Capacity sizing
Apple recommends a backup drive 2–3x the size of your Mac internal storage. A 512 GB MacBook needs at least a 1 TB backup drive; a 1 TB Mac needs 2–3 TB. Larger drives keep more backup history — Time Machine automatically prunes the oldest backups when the drive fills up.
HDD vs SSD
HDDs offer 3–5x more capacity per dollar. For a drive that sits on your desk, capacity wins. SSDs are better for portable backups — they survive drops, weigh less, and run silently. First backup takes 2–3x longer on HDD but incremental backups are fast on both.
USB-C connectivity
All modern Macs use USB-C / Thunderbolt. A USB-C drive connects directly without a dongle. USB-A drives work with an adapter but add a point of failure. For a permanent desk setup, the adapter is fine. For grab-and-go, native USB-C is cleaner.
Formatting
Time Machine requires APFS (macOS 11+) or Mac OS Extended (HFS+). Most drives ship as exFAT — macOS Disk Utility reformats them in seconds. If you also need the drive for Windows, consider partitioning: one APFS partition for Time Machine, one exFAT for shared files.
Related Buying Guides
Best Portable SSD for Mac
Find the best portable SSDs for Mac in 2026. USB-C and Thunderbolt external drives ranked by price per TB — compatible with MacBook, iMac, and Mac Studio.
Best External Hard Drives
Compare external hard drives and portable SSDs sorted by price per terabyte. Find the best USB drives for backup, travel, and extra storage on Amazon US and UK.
Best External Hard Drives for Backup
Find the best external hard drives for backup sorted by price per TB. Portable and desktop USB drives for Time Machine, Windows Backup, and NAS backup targets.
Best USB-C External SSDs
Compare USB-C external SSDs ranked by price per TB. Fast portable storage for laptops, desktops, PS5, and Mac — prices tracked hourly across Amazon.