How to Back Up a Computer and Check That You Can Restore Files

Decide what you need to recover

Start with irreplaceable items: family photos, documents, financial records, business files, and creative projects. Check Desktop, Documents, Pictures, Downloads, app-specific folders, and any external drives. Some email is stored with a provider; other mail archives live only on the computer. Make a list rather than assuming everything is in one folder.

A file backup protects selected files and versions. A system image aims to capture a broader machine state but needs a compatible recovery process and can become outdated. Cloud sync keeps selected folders consistent between devices. Decide whether you need individual files, a complete machine recovery, or both.

Set up a Windows file backup

For a personal Windows PC, File History can maintain versions of files in libraries on an external drive or network location. It is not a complete image of Windows and every installed application. Check its coverage explicitly, especially for folders outside the usual libraries.

1. Connect a suitable external drive with enough free space. Keep your originals on the computer.
2. Open Control Panel, then System and Security, then Save backup copies of your files with File History.
3. Choose Select drive if necessary, confirm the correct destination, and turn File History on.
4. Include additional important folders in a library when appropriate. Review excluded folders and check that a backup has completed.
5. Use File History to browse versions and restore a sample to a different location so the original is not overwritten.

Set up a Mac backup

Time Machine is the built-in Mac option for automatic versioned backups to suitable storage. Apple recommends a backup disk with at least twice the Mac’s storage capacity. Use a dedicated disk if possible and read any erase prompt carefully.

On recent macOS versions, open System Settings, General, then Time Machine and add the backup disk. Choose encryption when appropriate, storing its password somewhere you can recover without this Mac. Let the first backup finish. Browse Time Machine and restore a sample document to verify the process.

Use cloud storage with clear expectations

OneDrive, iCloud, and similar services can be useful parts of a backup plan, but syncing is not the same as an independent protected copy. A deletion or unwanted edit may synchronize. Version history and deleted-file recovery vary by service, account type, retention period, and subscription.

Files shown as online-only may not exist locally in full. Confirm what your backup software includes and how you would recover if the cloud account were locked. Review the provider’s restore instructions and storage limit before relying on it. For an additional cloud backup product, check encryption, version retention, recovery costs, and external-drive coverage.

Keep a copy apart and test recovery

A separate location helps against theft, fire, or damage affecting the entire desk. A disconnected backup can also be less exposed to malware that reaches attached storage. Rotate an external drive or use an appropriate off-site backup service according to the sensitivity of your files. Encryption protects a lost drive, but losing its recovery password can make the backup unusable.

Choose a schedule based on how much work you can afford to lose. Check the last successful run after major projects and periodically restore a few files. Open the recovered copy and confirm its contents, not just its filename. Record the backup location, recovery steps, and necessary credentials somewhere safely accessible. A backup that has never been checked is an assumption, not a recovery plan.