How to Back Up Your Phone and Computer (So You Never Lose Photos Again)

Phones get lost and hard drives fail. Here's a simple, reliable backup plan for iPhone, Android, Windows and Mac using the 3-2-1 rule.

Family photos, important documents, tax records, messages — much of our lives now exist only on our devices. A dropped phone, a stolen laptop, a failed hard drive or a ransomware attack can wipe them out in an instant. Backing up takes a little setup, then runs automatically. Here's how to do it right.

The 3-2-1 backup rule

Security experts, including the U.S. Cybersecurity and Infrastructure Security Agency (CISA), commonly recommend the 3-2-1 rule:

• 3 copies of your important data (the original plus two backups),
• on 2 different types of storage (for example, a cloud service and an external drive),
• with 1 copy kept off-site (the cloud counts) in case of fire, flood or theft.

You don't need to be perfect from day one. Even one automatic backup is far better than none.

iPhone and iPad

• iCloud Backup: Go to Settings → [your name] → iCloud → iCloud Backup and turn it on. Your device backs up automatically when it's charging, locked and on Wi-Fi. You may need more iCloud storage than the free amount.
• iCloud Photos: Turn on in Settings → [your name] → iCloud → Photos to keep your photo library synced and safe.
• Computer backup: You can also back up to a Mac (using Finder) or a Windows PC (using the Apple Devices app or iTunes). Choose "Encrypt local backup" to include saved passwords and health data.

Android

• Google backup: Go to Settings → Google → Backup (or Settings → System → Backup, depending on your phone) and turn on backup with your Google account. It saves app data, call history, contacts, device settings and messages.
• Google Photos: Turn on Backup in the Google Photos app to protect your photos and videos.
• Samsung phones also offer Samsung Cloud and Smart Switch for backups.

Windows PC

• Windows Backup / OneDrive: Windows 11 includes a Windows Backup app that can back up folders, settings and apps to your Microsoft account and OneDrive.
• File History: Found in the Control Panel, it automatically saves versions of your files to an external drive, so you can restore older copies.
• External drive: Keep a full copy of your important folders on an external hard drive or SSD.

Mac

• Time Machine: Connect an external drive and go to System Settings → General → Time Machine. It automatically keeps hourly, daily and weekly backups and lets you restore individual files or your whole Mac.
• iCloud Drive: Turn on "Desktop & Documents Folders" to sync those folders to iCloud.

Syncing is not the same as backing up

Cloud syncing services like iCloud Drive, OneDrive, Google Drive and Dropbox are convenient, but they mirror changes. If you delete or overwrite a file — or ransomware encrypts it — the change can sync everywhere. Many services keep deleted files or older versions for a limited time, which helps, but a separate backup, such as an external drive you disconnect after backing up, gives you an extra safety net.

Don't forget the rest

• Passwords: A password manager that syncs across devices protects these too.
• Two-factor codes: Make sure your authenticator app backs up or syncs, and keep your backup codes somewhere safe, or you could be locked out after losing your phone.
• Important documents: Scan IDs, insurance policies and tax returns and store them encrypted.

A simple plan to start today

1. Turn on automatic cloud backup on your phone.
2. Turn on photo backup.
3. Set up Time Machine or File History with an external drive for your computer.
4. Put a monthly reminder on your calendar to check that backups are still running.