AOMEI Backupper’s Encryption Features: Keeping Sensitive Backups Safe

If a laptop gets stolen, a backup drive goes missing, or an old external HDD ends up in a secondhand sale, whatever is sitting inside your backup images goes with it — tax documents, client files, password manager exports, the works. Most people lock down their live system with a login password and call it done, then leave years of backups sitting on a drive in plain, readable form. AOMEI Backupper’s encryption feature is built to close exactly that gap. Here’s what it actually does, how to turn it on, and where its limits are.

What AOMEI Backupper’s Encryption Actually Does

AOMEI Backupper can encrypt a backup image using the AES (Advanced Encryption Standard) algorithm — the same general class of cipher used across mainstream encryption tools. Turn it on, and the backup file itself becomes unreadable without the password you set; there’s no separate “unlock the drive” step, because the protection lives in the image file, not the disk.

That matters for the specific threat this feature addresses: not someone hacking your live PC, but someone getting physical or file-level access to a backup — a stolen external drive, a backup synced to an unsecured cloud folder, an old NAS sold without being wiped. An unencrypted backup image opens for anyone who has the file. An encrypted one doesn’t, regardless of how they got it.

How to Turn It On

Encryption is set per backup task, not as a global switch. When you create a new backup job in AOMEI Backupper, go to the “Start Backup” screen and click Options. Under the General tab you’ll find “Enable encryption for backups” — toggle it on, then enter and confirm a password (up to 24 characters). From that point on, every backup run under that task is encrypted with the password you chose.

Restoring is just as direct: when you try to restore (or even just browse) an encrypted image, AOMEI Backupper prompts for the password before it’ll touch the data. Get the password right, and restoring looks exactly like restoring any other backup.

Where It’s Limited — Read This Before You Rely on It

Three things are worth knowing upfront, because they’re the kind of detail that only matters at the worst possible time:

• Lost password = lost backup, permanently. AOMEI states this plainly: there’s no recovery mechanism. If you forget the password, the backup is as inaccessible to you as it is to anyone else. There’s no “forgot password” reset, no vendor-side override.
• You can’t change the password after the backup is created. Encryption is locked in at creation time for that backup task. If you want a different password, you’re setting up a new backup job, not editing the old one.
• It’s set when you create the task, not retroactively. There’s no documented way to go back and encrypt backup images you already made without encryption turned on — the option lives in the task setup, so existing unencrypted backups stay unencrypted unless you start a fresh backup job with encryption enabled.

None of this makes the feature less useful — it just means encryption should be treated like any other credential: written down somewhere safe (a password manager, ideally), not something you type once from memory and trust yourself to recall in six months.

Is This Overkill for a Home User?

Depends what’s in the backup. A backup of a gaming PC’s Steam library doesn’t need protecting from anyone. A backup that includes a Documents folder, browser profile exports, old tax PDFs, or anything with account numbers in it is a different story — and that’s most people’s “back up everything” backup, by default, whether they thought about it or not.

The practical rule: if you’d be upset to have the contents of that backup land in a stranger’s hands, encrypt it. The overhead is one checkbox and one password at setup — there’s no ongoing performance cost once it’s configured, since the encryption happens as the backup is written, not as a separate pass afterward.

Who Should Actually Turn This On

Anyone backing up to an external or removable drive that leaves the house — a drive kept at a different location for disaster recovery, one that travels with a laptop, or one that eventually gets resold or recycled. Anyone backing up to a NAS or cloud folder shared with other devices or accounts on the network. And honestly, anyone who’s already decided their data is worth backing up in the first place — if it’s worth protecting from loss, it’s usually worth protecting from exposure too.

It’s less critical for backups that never leave a single, already-encrypted, single-user machine — though even there, it’s a cheap insurance policy against the backup drive itself getting lost or stolen separately from the PC.

Frequently Asked Questions

Can I encrypt a backup I already created without encryption?

Not directly — encryption is a setting applied when a backup task is created, not something you can switch on for an existing backup image. To get an encrypted copy, set up a new backup task with encryption enabled.

What happens if I forget my backup’s encryption password?

The backup becomes permanently unreadable. AOMEI Backupper has no password recovery or reset option for encrypted backups, so the password needs to be stored somewhere reliable, like a password manager, not just memorized.

Is AES encryption actually strong, or just a marketing term?

AES is a genuine, widely used encryption standard, not a marketing label — it’s the same general algorithm family used across mainstream security software. The real-world strength of any AES-protected backup still comes down to how strong and unique the password you choose is.

Does encrypting a backup slow down the backup process?

There’s no separate encryption pass to wait through — the backup is written in encrypted form as part of the normal backup run, so it doesn’t add an extra step after the fact. Day-to-day, the main thing to plan for is remembering the password, not performance.