To back up a computer, copy important files to a separate device and verify that the copies can be opened.
Updated August 12, 2026, after a fresh review, with updated visuals and links.
A backup protects against drive failure, accidental deletion, and some device problems, but one copy is not enough for irreplaceable files.
What You Need
- An external drive with enough space
- A USB cable
- The computer backup tool
- A second location for critical files
Step 1: Choose What Matters
Include documents, photos, projects, settings, and other files that would be difficult to recreate. Do not assume every download needs a backup.
Step 2: Connect and Format Carefully
Connect the drive and confirm its name before copying. Formatting erases a drive, so back up existing contents first.
Step 3: Run the Backup
Use the operating system backup tool or copy organized folders manually. Keep the first backup connected until it completes.
Step 4: Verify the Copy
Open several files from the external drive and check the backup date. Eject the drive safely and store it away from the computer when finished.
What to Avoid
- Copying without a plan: Important folders can be missed.
- Never testing files: A backup that cannot open is not useful.
- Keeping it beside the computer: Theft, fire, or spills can affect both copies.
Final Thoughts
A useful computer backup is separate, current, organized, and tested. Start with irreplaceable files and add a second location for the most important data.
