Nobody puts on a seatbelt because they plan to have an accident. They put it on because accidents don’t announce themselves. The seatbelt isn’t for the drive you expect — it’s for the one you don’t.

A backup works exactly the same way. You don’t need it right up until the moment you need it urgently, completely, and with no time to prepare.

Hard drives fail. Laptops get dropped, stolen, or soaked. Ransomware encrypts everything and demands payment. A well-meaning family member deletes something irreplaceable. A Windows update goes wrong. These things happen to ordinary people every day — and the difference between a bad afternoon and a genuine catastrophe is whether or not a backup exists.

What a backup actually is

A backup is simply a copy of your important files stored somewhere separate from your computer. That’s it. If your computer is the original, the backup is the spare. And the spare only helps if it’s kept somewhere other than the same place as the original.

A copy of your photos saved to a folder on the same hard drive is not a backup. If the drive fails, both copies fail together. A backup has to live somewhere independent — an external drive, a cloud service, or ideally both.

What’s worth backing up

You don’t need to back up everything. Programs can be reinstalled. Windows can be restored. What cannot be replaced is:

• Photos and videos — especially anything from before smartphones that only exists as a digital scan
• Personal documents — tax returns, medical records, legal papers, financial statements
• Email, if it’s stored locally rather than on a server
• Creative work — writing, music, art, anything you’ve made
• Contacts and calendar data, if not already synced to a cloud account

Ask yourself: if this computer disappeared tomorrow, what would I genuinely grieve losing? That’s what needs a backup.

Your options — simple and practical

External hard drive. A physical drive you plug into your computer. Relatively inexpensive, holds a lot, and easy to use with Windows Backup or macOS Time Machine. The weakness: it has to be plugged in to work, and if it lives next to your computer, a fire or flood takes both. Still vastly better than nothing.

Cloud backup. Services like iCloud, Google Drive, OneDrive, or Backblaze automatically copy your files to remote servers. Works in the background, offsite by definition, and accessible from any device. The weakness: requires a reliable internet connection and an ongoing subscription for larger storage. For most people, a modest cloud plan covers everything that matters.

Both. The right answer for anything truly irreplaceable. Local for speed and convenience, cloud for protection against physical loss.

The backup that isn’t actually a backup

A word about USB flash drives. The small thumb drives people carry on keychains or keep in a drawer. They are useful for moving files from one place to another. They are not reliable long-term storage. They fail without warning, they get lost, and they are not a substitute for a real backup system. Don’t rely on one for anything you can’t afford to lose.

How often

As often as your files change. If you add photos every week, your backup should run at least weekly. If you’re working on something important daily, daily. Cloud services handle this automatically once set up — which is one of their best qualities. The backup you don’t have to remember to do is the one that actually gets done.