A backup only matters if you can bring things back from it, so this guide is built around that test: after every backup, you should be able to answer 'where are my photos?' and find them.

The 3-2-1 idea, made simple

The standard advice is 3-2-1: three copies of your data, on two different kinds of storage, one of them somewhere else. For a home computer that usually means: your PC's disk, an external hard drive you plug in, and a cloud folder (Google Drive, OneDrive or Dropbox). You don't need all three on day one, but work towards it.

Step 1 — Decide what actually matters

You don't need to back up programs — you can reinstall those. Focus on:

  • Documents — Documents, Desktop, and any folders you create in them.
  • Photos and videos — often the most valuable stuff you own. Check whether apps save photos into hidden folders (phones, cameras).
  • Browsers — bookmarks and passwords. Export bookmarks and make sure your browser's password manager is synced or exported.
  • Email — if it's local (Outlook .pst), back that file up. If it's Gmail or similar, it's already in the cloud.
  • Game saves — check where each game stores saves (many are in Documents or in the cloud via Steam/Epic).

Step 2 — Automate the files

Windows has File History (Settings → System → Backup → 'Add a drive'). Point it at an external drive and it copies your Documents, Desktop, Pictures, Music and Videos automatically on a schedule. Plug the drive in when you want a backup.

Alternatively, a sync folder like OneDrive or Google Drive keeps your chosen folders current on the cloud with zero effort — the trade-off is a subscription or storage cap.

Step 3 — A full system image (the safety net)

File History covers files; an image captures the whole PC — Windows, programs, settings. Windows 10/11 no longer ships a full image tool by default, so the common route is the built-in 'Recovery drive' for emergencies plus a third-party image tool (Macrium Reflect free, or the OEM's backup software). Create an image after you've got the PC set up the way you like it, and again after major changes.

Step 4 — Test it

This is the step everyone skips and the one that matters. Restore one random file from your external drive. Open a photo from the cloud. If you can't, your backup isn't really a backup.

How often?

  • Files: automatically, every day or week, via File History or a sync folder.
  • System image: monthly, or after any big change (new GPU, Windows feature update).
  • The cloud copy: continuous, if you use a sync folder.
The cheapest, most common disaster isn't a hard-drive failure — it's a drive failure plus realising you never checked your backup worked. Test once a year and it will save your year.