Option A: External hard drive / USB backup
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Plug in your external storage.
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Open File Explorer (Windows) or Finder (Mac).
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Manually drag and drop key folders (Documents, Photos, etc.).
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Optionally, use built-in backup tools:
| OS | Tool | Steps |
|---|---|---|
| Windows | File History | Settings → Update & Security → Backup |
| macOS | Time Machine | System Settings → Time Machine |
Set to back up daily or weekly.