Most people set up a backup and assume their data is safe. But I learned that an unencrypted backup is almost as risky as losing the device itself: anyone who gets the external drive or accesses an exposed archive can browse your files without a login or any special software. The backup you created to protect yourself can become the biggest vulnerability in your setup.
Encrypting your backups is a one-time, ten-minute setup on every major platform. Once it is done, a stolen drive gives a thief nothing but scrambled data they cannot use.
Quick Answer
To encrypt your backups: on iPhone, connect to a Mac or PC, open Finder or iTunes, and tick Encrypt local backup before clicking Back Up Now. On Windows, enable BitLocker on your backup drive. Android’s Google backup is encrypted by default. For external drives, use VeraCrypt (free) or your operating system’s built-in encryption tool.
Why Does Encrypting Your Backups Matter?
A backup is a complete copy of your device — contacts, photos, saved passwords, and banking app data. Without encryption, anyone who physically accesses that backup can open your files in minutes using standard software. No hacking, no special skills required.
Encryption converts your files into ciphertext that is only readable with the correct passphrase. I keep my Windows backup on an encrypted external drive, and when it once slipped out of my bag at a coffee shop, I knew the contents were unreadable to whoever picked it up.
Encrypting a backup adds almost zero overhead but turns a stolen drive from a catastrophe into a minor inconvenience.
How Do You Encrypt an iPhone Backup?
Apple’s local iPhone backup is not encrypted by default. You have to turn it on manually. Here’s how, on a Mac or Windows PC:
- Connect your iPhone with a USB cable. Open Finder on Mac or iTunes on Windows.
- Select your device. In Finder, click the iPhone in the left sidebar. In iTunes, click the device icon near the top left. Navigate to the General tab.
- Tick Encrypt local backup in the Backups section. You’ll be prompted to set a password. Save it in a password manager immediately — Apple has no way to recover it for you.
- Click Back Up Now. The encrypted backup now includes Health data, saved Wi-Fi passwords, and keychain credentials that Apple excludes from unencrypted copies.
Pro tip: After the backup finishes, go to iTunes > Preferences > Devices. A padlock icon next to the backup confirms encryption is active.
If you have not set up iPhone backups yet, my guide on backing up your iPhone to iCloud and your computer covers the two-layer strategy I use every week.
An encrypted iPhone backup also gives you a more complete backup — Apple withholds Health history and keychain data from unencrypted copies, so encryption is an upgrade in both security and completeness.
How Do You Encrypt Windows Backups?
The fastest way to protect a Windows backup drive is BitLocker, which encrypts the entire drive at the operating system level.
- Plug in your backup drive. Open File Explorer, right-click the drive, and select Turn on BitLocker. On Windows 11 Home, look for Device Encryption under Settings > Privacy & Security instead.
- Choose a password to unlock the drive, then save the recovery key to your Microsoft account or print it and store it somewhere other than the drive itself.
- Run your backup normally — via Settings > System > Storage > Backup or a tool like Macrium Reflect Free. Every file written to the drive is encrypted automatically from this point forward.
Troubleshooting tip: If BitLocker asks for the recovery key unexpectedly after a Windows Update, sign in to your Microsoft account and look under Devices > [your PC name] > BitLocker to find the saved key.
BitLocker encrypts at the drive level, so every backup you run — now and in the future — is protected without any extra steps after the initial setup.
Which Tool Should You Use for an External Drive?
If your Windows edition does not include BitLocker, or you back up to drives shared between Windows and Mac, VeraCrypt is the best free cross-platform alternative.
| Tool | Platforms | Free | Best For |
|---|---|---|---|
| BitLocker | Windows Pro/Enterprise | Yes (built-in) | Windows whole-drive encryption |
| VeraCrypt | Windows, Mac, Linux | Yes | Cross-platform or portable drives |
| macOS FileVault | Mac | Yes (built-in) | Mac whole-drive + Time Machine backups |
| 7-Zip (AES-256) | Windows, Mac, Linux | Yes | One-off encrypted archive files |
For ongoing backups, built-in tools are the simplest choice — encryption happens in the background with no extra steps. Use VeraCrypt when you need a portable encrypted container that opens on any operating system.
Start with the tool built into your OS; reach for VeraCrypt only when you need cross-platform access or your Windows edition lacks BitLocker.
Are Cloud Backups Already Encrypted?
Yes and no. Most major cloud services encrypt your data in transit and at rest — but the provider holds the encryption key. That means Google, Apple, or another service can technically read your files if compelled by law or in a security incident.
For sensitive documents like tax returns or medical records, use a zero-knowledge service such as Proton Drive or Backblaze Personal Backup (which lets you set a private key only you hold), or encrypt files locally with Cryptomator (free, open-source) before uploading them to Google Drive or iCloud.
Cloud encryption protects your data in transit; zero-knowledge encryption protects it from the provider itself — a meaningful distinction if you store financial or medical files.
What Mistakes Should You Avoid When Encrypting Backups?
- Forgetting the encryption password. Without it, you cannot restore the backup. Fix: save it in a password manager the moment you create it.
- Storing the recovery key on the encrypted drive. If you lose access to the drive, the key is gone too. Fix: save it to your Microsoft account or store a printed copy somewhere separate.
- Assuming cloud storage equals encrypted backup. Most providers hold the keys. Fix: use a zero-knowledge service or encrypt locally with Cryptomator before uploading.
- Never testing a restore. An encrypted backup you cannot successfully restore is useless. Fix: do a test restore to a spare folder every few months to confirm everything works.
- Using a weak passphrase. Encryption is only as strong as the password protecting it. Fix: use a random 16-character passphrase generated by a password manager.
Frequently Asked Questions
Does encrypting a backup slow down my computer?
Barely. Modern processors handle AES encryption in hardware. I back up a 300 GB drive with BitLocker enabled regularly, and the speed difference is negligible after the initial encryption pass completes. For example, my backup runs at roughly the same pace — around 120 MB/s — whether BitLocker is on or off.
Can I encrypt a backup I already made?
For iPhone, enabling the setting and running a new backup creates a fresh encrypted copy that replaces the old one. For Windows drives, BitLocker encrypts the whole drive in the background — you do not need to delete existing backup files first.
What happens if I forget my iPhone backup password?
Apple cannot reset it. You would need to factory-reset the device, set it up as new, and start a fresh encrypted backup. There is no recovery path without the original password — I save mine in my password manager the same day I create it.
Is VeraCrypt hard for a beginner?
It has more setup steps than BitLocker, but the documentation is thorough and the community forums are helpful. For most Windows users, BitLocker or Device Encryption is simpler and just as effective. Reach for VeraCrypt only if you genuinely need cross-platform access between Windows and Mac.
Conclusion
Encrypting your backups takes ten minutes and protects you permanently. Start with the two highest-risk items: your iPhone local backup and any external drive you carry outside the house. If either is ever stolen, you’ll be glad encryption was already on.
For the next step in locking down your digital life, read my guide on how to protect your identity after a data breach — it covers what to do when a service you use gets compromised.