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How Do You Back Up a File?
To back up a file quickly, copy it to a second place: a USB drive, an external disk, a NAS or a cloud backup service. For files that change often, use automatic backup with version history. One copy is better than none; two copies in different places is far better.
| Method | Automatic? | Keeps versions? | Protects against theft or fire? | Best for |
|---|---|---|---|---|
| Copy to USB or external drive | No | No | Only if stored elsewhere | One-off important files |
| Windows File History | Yes | Yes | No (local drive) | Windows users with a spare drive |
| Time Machine | Yes | Yes | No (local drive) | Mac users |
| Cloud backup service | Yes | Yes | Yes | Everyone, as the offsite copy |
| Upload to a sync service | Yes, for synced folders | Short history | Yes | Working files; not a full backup |
What You Need Before You Start
- The file or folder you want to protect, and its size.
- A second storage location with enough space.
- For automatic methods, ten to twenty minutes of setup.
Method 1: Copy the File to an External Drive
- Plug in a USB stick or external drive.
- Open File Explorer on Windows or Finder on Mac.
- Drag the file or folder onto the drive while holding Ctrl (Windows) or Option (Mac) to copy rather than move.
- Open the copy on the drive to check it works.
- Unplug the drive and store it somewhere safe.
Simple and offline, but it is only as current as your last copy.
Method 2: Turn On Windows File History
File History saves copies of files in your user folders to an external drive on a schedule and keeps older versions.
- Connect an external drive.
- Open Control Panel > System and Security > File History.
- Select the drive and click Turn on.
- Use Advanced settings to set how often copies are saved and how long they are kept.
To restore, open File History and browse to the date you need.
Method 3: Use Time Machine on a Mac
- Connect an external drive.
- Open System Settings > General > Time Machine.
- Click Add Backup Disk and choose the drive.
Time Machine backs up hourly while the drive is connected. To get the backup offsite too, see Time Machine backup to cloud.
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Method 4: Back Up Files to the Cloud Automatically
A cloud backup service copies files from your computer to its servers and keeps versions. Because the copy is offsite, it survives theft, fire and drive failure.
- Choose a service from our backup cloud services list.
- Install the app and sign in.
- Check that your important folders are included.
- Let the first backup finish.
Our pillar guide to back up to the cloud has the full setup.
Method 5: Back Up a Whole Drive
Backing up a drive means copying everything on it, not just one folder.
- For data drives, use a backup app or FreeFileSync to copy the drive to another disk.
- For your system drive, use an image backup tool that can restore Windows or macOS as well as files.
- For external drives, make sure your cloud backup app includes them and connect them regularly.
How to Verify a File Backup
- Open the backed-up copy and confirm it is complete.
- For automatic tools, check the last backup time.
- Restore one older version to a new folder.
I tell everyone the same thing: a backup only counts once you have restored from it at least once.
Common Mistakes
- Moving instead of copying. Then you still have only one copy.
- Keeping the backup next to the computer. Fire or theft takes both.
- Using sync as backup. Sync deletes everywhere. Read backup and sync.
- Never checking. Backups silently stop after drive or password changes. If yours stalls, see backup stuck.
Windows users can also follow our step-by-step guide on how to back up a Windows PC to the cloud.
Frequently Asked Questions
What is the easiest way to back up a file?
The easiest one-off method is to copy the file to a USB stick or external drive, then store the drive somewhere else. For files you change often, turn on automatic backup with File History on Windows or Time Machine on Mac, and add a cloud backup service for an offsite copy.
How many backup copies should I keep?
Follow the 3-2-1 rule: three copies of your data, on two different types of storage, with one copy offsite. For example, keep the original on your computer, a copy on an external drive, and a copy with a cloud backup service. This protects against most common causes of data loss.
Is emailing a file to myself a backup?
It gives you a second copy in an email account, which is better than nothing for a single small file. It is not a reliable backup method, because attachments have size limits, nothing is automatic, and email accounts can be lost or hacked. Use a proper backup tool for anything important.
How often should I back up my files?
Back up as often as you can bear to lose work. Automatic tools like File History, Time Machine and cloud backup apps run hourly or continuously, which suits most people. For manual copies to a drive, a weekly routine is a reasonable minimum for important files.
Does Windows have a built-in file backup?
Yes. File History saves versions of files in your user folders to an external drive, and the Windows Backup app saves folders, settings and app lists to OneDrive. File History keeps older versions locally, while Windows Backup relies on OneDrive sync, so use both or add a separate cloud backup.
Keep your files safe and in sync
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