How to create secure, accessible digital backups of critical documents — scanning, encryption, cloud storage, offline backup, and ensuring access when you need it most.
A digital backup of your critical documents provides access to essential information even when physical documents are destroyed, stolen, or left behind during an evacuation. Unlike physical copies, a properly created digital backup is accessible from anywhere in the world with internet access, and can be maintained more easily than a collection of paper copies.
The key challenges are security (sensitive documents must be protected from unauthorised access) and accessibility (the backup must be readable when you need it, including without power or internet). This article covers how to address both.
| Document | Format |
|---|---|
| Passport (both sides, including all pages with stamps/visas) | High-resolution photo or scan |
| Driving licence (front and back) | High-resolution photo or scan |
| Birth certificate | Scan |
| Insurance policy documents (home, vehicle, health, life) | Scan or PDF |
| Medication list and medical summary | Typed document |
| Bank account numbers and contact details | Typed document (encrypted) |
| Property deeds or tenancy agreement | Scan |
| Vehicle registration | Scan |
| Emergency contact list | Typed document |
A document scanner produces higher quality, more legible copies than a phone photo. However, a phone is usually sufficient for emergency purposes.
Phone photography guidelines:
Scanning apps: Apps such as Adobe Scan, Microsoft Lens, and Apple's built-in document scanner automatically process photos into PDF format with perspective correction.
PDF is the recommended format for documents. Use a consistent, descriptive filename: passport_[name]_front.pdf rather than IMG_4827.jpg.
Cloud storage provides anywhere-access but requires internet connectivity and is vulnerable to account compromise.
| Service | Encryption | Access |
|---|---|---|
| iCloud (Apple) | End-to-end encryption available | Apple devices; web browser |
| Google Drive | Encrypted in transit and at rest (not end-to-end by default) | Any browser; Android |
| Dropbox | Encrypted in transit and at rest | Any browser |
| ProtonDrive | End-to-end encrypted by default | Browser; dedicated app |
Security requirements for cloud document storage:
⚠️ Standard cloud storage without additional encryption is not suitable for highly sensitive documents such as bank account numbers, National Insurance numbers, or medical records. Use end-to-end encrypted storage (ProtonDrive; encrypted folder) for these documents.
For the highest sensitivity documents, create an additional encryption layer:
Method 1 — Encrypted PDF: Many PDF creation tools allow you to set a password on a PDF. This encrypts the file so it is only readable with the password.
Method 2 — Encrypted archive: Create a 7-Zip (.7z) or encrypted ZIP archive of sensitive documents with a strong password. These can then be stored in standard cloud storage safely.
Method 3 — Veracrypt or similar: A dedicated encryption tool creates an encrypted container file. High security; higher complexity.
Password storage: The encryption password must be remembered or stored securely (password manager). A document that is encrypted with a forgotten password is permanently inaccessible.
An encrypted USB drive provides access without internet and serves as a backup when cloud services are unavailable.
| Requirement | Detail |
|---|---|
| Hardware encryption | Some USB drives have built-in hardware encryption — preferred |
| Encryption software | VeraCrypt or BitLocker (Windows) or FileVault (Mac) encrypt the drive |
| Stored location | Away from the home — at a trusted relative's; bank safety deposit box |
| Size | 16GB is more than sufficient for documents |
| Update frequency | Update whenever documents change; at minimum annually |
Why stored away from home: If the emergency affects the home (fire, flood, burglary), a USB drive stored in the same building is also at risk.
In an emergency with network access, cloud documents are available immediately. But if the network is down:
Regardless of the full backup system, create a single document summary sheet:
| Section | Contents |
|---|---|
| Identity | Full name; date of birth; NI/SS number; passport number; driving licence number |
| Emergency contacts | 3–4 key contacts with name, relationship, and phone number |
| Bank | Account numbers; bank emergency phone numbers |
| Insurance | Policy numbers; insurer names and phone numbers |
| Medical | Blood type; key conditions; medications; GP contact |
| Property | Property address; mortgage account number; lender contact |
Two copies of this sheet:
This sheet allows you to access or contact every critical service from memory, phone, or paper, without needing the full documents.
| Task | Frequency |
|---|---|
| Update after any document change | Immediately (new passport; new insurance; medication change) |
| Check offline/downloaded access works | Every 6 months |
| Update USB drive | Every 6–12 months |
| Review and remove outdated documents | Annually |
| Check cloud account access and 2FA | Annually |
| Storage Layer | Purpose | Requires |
|---|---|---|
| Cloud (encrypted) | Anywhere access | Internet + account login |
| USB (encrypted, stored away) | Offline backup; safe from home emergency | Physical access to USB |
| Phone (downloaded) | Access without internet during emergency | Charged phone |
| Printed summary sheet (go-bag) | Access without phone or internet | Paper and ability to read |
| Format | PDF preferred | — |
| Security minimum | Strong password + 2FA on cloud account | — |
| High-sensitivity documents | End-to-end encryption (ProtonDrive) or encrypted file | — |
| Update trigger | Any document change; annually at minimum | — |
Take Creating and Maintaining Digital Document Backups with you — no internet needed when it matters most.
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