Quick answer: Use automatic backups to an external drive or trusted cloud service, keep a second copy away from the computer, and test that important files can be restored.
A computer backup protects you from drive failure, theft, accidental deletion, malware, and hardware damage. The safest approach combines automatic local backups with a second copy stored elsewhere.
What should you back up?
Prioritise:
- Documents
- Photos and videos
- Work and school projects
- Financial records
- Browser bookmarks
- Email archives
- Password-manager recovery information
- App data and settings
Operating-system files can often be reinstalled. Personal files are usually harder to replace.
Use an external drive.
Choose a drive with enough capacity for your files and future growth. Connect it regularly or leave it connected if your backup system is designed for continuous use.
Keep the drive separate from the computer when it is not backing up. A drive stored beside a laptop can be lost or damaged at the same time.
Back up a Windows PC.
Windows includes built-in backup and file-history options. Open Settings and search for Backup, File History, or Windows Backup, depending on your version.
Choose the folders and account data you want to protect, connect the external drive if required, and confirm that backups are running. Keep a record of the last successful backup.
Back up a Mac.
Time Machine can back up a Mac to a compatible external drive or supported network location:
- Connect the backup drive.
- Open System Settings.
- Search for Time Machine.
- Add or select the backup disc.
- Enable automatic backups.
Menu names may vary by macOS version.
Use cloud backup as a second copy.
Cloud storage can protect files if the computer and external drive are lost together. Choose a reputable provider, enable two-factor authentication, and understand storage limits and subscription costs.
Sync is not always the same as backup. If a file is deleted and the deletion syncs everywhere, you may not have a separate historical copy. Check whether the service offers version history or recovery.
Follow the three-copy principle.
For important files, aim for:
- The working copy on your computer
- A local backup on an external drive
- A second backup in the cloud or another physical location
This protects against more than one type of failure.
Test the backup.
A backup is only useful if it can be restored. Open several backed-up files, check their dates, and practise restoring a file to a different folder. For a full computer backup, learn the recovery process before an emergency occurs.
Protect the backup itself.
Use encryption where appropriate, secure your cloud account with two-factor authentication, and do not share access links publicly. Disconnect an external backup drive when it is not needed if ransomware is a concern.
Final verdict
Automate a local backup, keep a second copy elsewhere, and test restoration regularly. Do not wait for a failed drive or stolen laptop to reveal that your backup was incomplete.
