Back Up Your Files the Simple 3-2-1 Way
The 3-2-1 backup rule is the gold standard for protecting your files — and you can set it up for free using tools already in Windows. Here's how.
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Backing up your files is one of the most important things you can do for your digital security. It protects you from ransomware, hardware failure, accidental deletion, and theft. The 3-2-1 rule is the standard recommended by security professionals and is simpler to follow than it sounds.
What is the 3-2-1 Rule?
- 3 copies of your data
- On 2 different types of storage
- With 1 copy kept off-site (away from your home)
In practice: your original files on your computer, a copy on an external hard drive, and a copy in the cloud.
Copy 1 + 2: Windows Backup to an External Drive
Windows includes a free backup tool. Plug in an external hard drive (they're inexpensive and widely available), then:
- Go to Settings > System > Storage > Advanced storage settings > Backup options.
- Under Back up using File History, click Add a drive and select your external drive.
- Turn on Automatically back up my files.
- Click More options to set how often to back up and how long to keep versions.
File History will now regularly back up your Documents, Pictures, Music, Videos, and Desktop folders automatically.
Copy 3: A Free Cloud Backup
The off-site copy protects you if your home is burgled, flooded, or affected by fire — scenarios where both your computer and your external drive could be lost at once.
- OneDrive — built into Windows and included free with a Microsoft account (5 GB free). Enable it from the OneDrive icon in your taskbar. Your Documents and Pictures folders can sync automatically.
- Google Drive — 15 GB free, with the Backup and Sync tool for Windows.
Test Your Backup
A backup you've never tested is a backup you can't trust. Every few months, try restoring a file from your backup to make sure it works. In File History, click Restore personal files to browse and recover any backed-up file.
Not sure your backup is set up correctly? Ask us and we'll check it with you.
Frequently asked questions
How much storage do I need on an external hard drive for backup?
A general rule is to get a drive at least twice the size of the data you want to back up, since File History keeps multiple versions of files. For most home users, a 1 TB or 2 TB external hard drive is more than enough and is very affordable. Check your current disk usage in Settings > System > Storage to see how much you're using.
Is OneDrive safe enough to store my personal files?
Yes, for most personal use. Microsoft OneDrive uses strong encryption in transit and at rest, and your files are protected by your Microsoft account password. Enable two-factor authentication on your Microsoft account for extra security. For highly sensitive documents (like tax records), consider whether you want them in the cloud at all, or use an encrypted folder within OneDrive.
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