Free buying guide · backups
External backup drive sizing guide
Choose a drive around the files you need to recover and the backup method you will actually use. Capacity is only one part of the decision.
1. List what must survive
Write down the devices and folders that matter: photos, documents, and any local files that are not already backed up elsewhere. Check their current storage use in the device’s settings.
2. Leave room for change
Your files will grow, and some backup tools keep older versions. Check the space your chosen backup software recommends and allow room beyond today’s file total. Do not treat a sync folder as your only recoverable copy.
3. Confirm the fit
Check that the drive connects to your computer and is supported by its backup software. Consider where you will store it, whether it needs its own power, and whether you can keep one copy away from the device it protects.
4. Try a restore
Back up a harmless test file, then restore and open it. A drive is useful only when you can get the right files back. Repeat that check after a major device or backup-setting change.
Write down the devices, current file sizes, backup software, and restore date before choosing a model. You can start with a drive you already own if it has enough usable space and works reliably.
Preview the Beginner backups chapter →