Backing Up a Drive: Clone or Back Up a Hard Drive (Guide)

What Is the Best Way of Backing Up a Drive?

Clone vs image vs file backup

Method	What you get	Keeps versions	Best for
Clone	A bootable copy on a second disk	No, one point in time	Swapping to a new SSD
Disk image	One file holding the whole disk	Some tools keep several images	Restoring a system exactly
File backup	Copies of files, with history	Yes	Everyday protection
Cloud backup	Off-site copies of files	Yes	Fire, theft and ransomware

Over ten years, I have cloned many drives before upgrades and restored many files from backups after mistakes. The two jobs feel similar but protect against different problems. This guide to backing up a drive shows when to use each.

When Should You Clone a Drive?

Clone a drive when you move to a new, larger or faster disk, or before risky changes such as a major operating system upgrade. A clone lets you swap disks and boot straight away.

The weakness is time. A clone is one moment. If you deleted a file last week, the clone made today does not have it. Clones also copy problems such as malware.

How to Back Up a Drive With Files and Versions

1. Pick a target drive at least twice the size of the data you protect.
2. Choose the tool. File History on Windows, Time Machine on Mac, or Deja Dup or restic on Linux.
3. Select folders or the whole drive. Skip system caches and temporary files.
4. Turn on encryption for the backup drive.
5. Set a schedule, such as hourly or daily.
6. Add an off-site copy with a cloud backup service.
7. Test a restore of a file and an older version.

Our guides to Windows backup, Mac and Time Machine and Linux backup cover each system in detail.

How to Back Up an External Drive

External drives often hold archives that exist nowhere else. Treat them as data to protect, not as a backup by themselves.

• Include the drive in a cloud backup service that supports external drives.
• Plug it in regularly. Backblaze, for example, may remove a drive’s data if it stays disconnected for more than 30 days on its default plan.
• Keep a second local copy of irreplaceable archives on another drive.

Common Mistakes When Backing Up a Drive

Most problems with backing up a drive come from three habits.

Calling a single external drive a backup

If your only copy of old photos is on one external drive, that drive is the original. It needs its own backup.

Leaving the backup drive always connected

Ransomware can reach connected drives. CISA advises keeping backups offline. Unplug drives between backups where possible.

Mixing RAID with backup

RAID mirrors protect against one disk failing, but they copy deletions instantly. Read our guide to a backup of backup for the full picture.

Privacy and Old Drives

Encrypt backup drives, especially portable ones. Before you sell, recycle or give away an old drive, wipe it securely or physically destroy it. Old backup drives are a common source of leaked personal data.

For backing up a NAS, see our NAS backup guide.

Frequently Asked Questions

Is cloning a drive the same as backing it up?

Not quite. A clone copies the whole disk at one moment and can be booted. A backup keeps versions over time, so you can restore files deleted or changed days ago. Clones are best for disk upgrades, while versioned backups are best for everyday protection.

How long does it take to back up a whole drive?

It depends on data size and speed. Copying 500 GB to a fast USB SSD can take under an hour, while a slow hard drive may take several hours. A first cloud upload of the same data can take days. Later backups only copy changes, so they are much faster.

What size backup drive do I need?

For a versioned backup, choose a drive at least twice the size of the data you protect, so older versions fit. For a clone, the target must be at least as large as the used space on the source, and often as large as the whole source disk.

Should I use an SSD or a hard drive for backups?

Hard drives give more space for the money and suit large backups. SSDs are faster and tougher for portable use. Either works for backups. What matters more is keeping a second copy off site and replacing drives as they age.

Can I back up a drive to the cloud?

Yes. Many cloud backup services back up internal and external drives, often with version history. Check whether the service supports external drives and how often they must be connected. Large first uploads take time, so start with your most important folders.