Ransomware Restore from Backup After Attack [Complete Guide]

This article describes how to safely perform ransomware restore from backup, prevent reinfection, and build a layered defense with backups and AOMEI Ransomware Protection. Scroll down to learn more!

By @Ivy
Last Updated January 27, 2026

Can You Perform Ransomware Recovery After an Attack?

Yes, ransomware recovery is possible, but only if you have clean, unaffected backups. Decryption tools rarely work, and paying the ransom offers no guarantee your data will be returned. Many victims either receive broken decryption keys or are attacked again, making ransomware recoverythe most reliable method.

Modern ransomware doesn’t just encrypt files; it targets entire systems, attempting to disable security software, delete backups, and spread across connected devices. A “safe” backup is one created before the attack, kept isolated from the infected system, and verified to be malware-free. Restoring from such a backup allows you to recover data without reintroducing the ransomware.

How to Perform Ransomware Restore from Backup Safely

Ransomware recovery must follow a verified, malware-free process to avoid reinfection or data loss. The specific steps are as follows:

Step 1. Evaluate the scope of damage to determine the affected systems, files, accounts, and backups. CISA recommends using out-of-band communication methods (such as phone calls) at this stage to avoid alerting attackers to their exposure and prevent them from learning about your response plans.

Step 2. Isolate infected devices. You can disconnect wired and wireless networks, remove VPN access, and pause backup or replication tasks to prevent ransomware from spreading or contaminating clean data.

Step 3. Activate incident response protocols and notify the IT, security, and management teams to coordinate the isolation, cleanup, and restoration steps. Be sure to document all actions in detail with timestamps.

Step 4. Identify ransomware variants and determine if known decryption tools exist. If yes, prioritize attempting to decrypt the system. If not, it’s suggested to erase C drive or the entire disk for a clean environment.

Step 5. Select a restore point created before the infection and confirm it is clean and intact. Perform a full system restore if the operating system or core components are compromised. For specific data and the system itself is safe, try file-level restore.

Best Practices for Ransomware-Ready Backup Strategies

Here are 3 key points for ransomware-ready backup strategies. Read them carefully before creating any backup.

#1: Set Offline, immutable, and versioned backups

To protect against ransomware, backups should be offline, immutable, and versioned.

  • Offline backups are disconnected from the network, preventing malware from reaching them.
  • Immutable backups cannot be modified or deleted for a set period, ensuring they remain safe even if ransomware infects thesystem.
  • Versioned backups create multiple backup copies and allow you to restore previous copies of files from a point in time before the attack.

#2: Recommended backup frequency

Backup frequency should match how often data changes.

  • Home users can usually back up weekly or biweekly, focusing on personal documents and media.
  • Businesses should back up critical systems daily or even hourly for high-value data, ensuring minimal data loss in case of ransomware.

#3: Test restore workflows before ransomware strikes

Regularly test therestore process to confirm backups are complete, functional, and malware-free. Simulating a ransomware recovery helps identify gaps, ensures the team knows the steps, and guarantees that data can be restored quickly and safely when an actual attack occurs.

Prevent Reinfection After Ransomware Recovery

Restoring from backups alone does not guarantee safetyas ransomware can strike againif the system remains vulnerable. Even after a successful restore, malware can re-encrypt files, spread to other devices, or compromise clean backups if no protection is in place. That’s why ransomware backup and recovery must be paired with active, real-time ransomware protection.

AOMEI Backupper Professional integrates multiple backup solutions as well as Ransomware Protection to create multiple backup images and protect them safely.

AOMEI Backupper
Proactive Ransomware Protection Software
  • Behaviour-based Protection: Monitor system behavior in real time and block suspicious operations, adding a critical layer of defense against deletion or tampering.
  • Protection Target: Backup images created by AOMEI Backupper, specific file types, files and folders.
  • Access Restrictions: Add trusted or blocked apps or folder paths and decide if they can modify or delete protected files or folders.
  • Flexible Backup Solutions: Create a system image or disk backup, depending on what you want.
  • Complete Backup Feature Suite: Include schedule backup, incremental backup, backup cleanup, encryption, compression, etc., to enhance security or optimize disk space.

So both home users and businesses can effectively withstand long-term resilience against ransomware threats.

Step 1. Open AOMEI Backupper Professional after installing. Click Backup and select the desired backup solution, preferably system backup or disk backup. Follow the on-screen instructions to create backup images.

📍📍📍Notes:
✅ To set up or change backup settings, click Options, Backup Scheme, Schedule.
✅ The incremental backupis the default option in a scheduled task.
✅ You can change the backup settings in the Home tab. Locate the backup task, click the three-dot icons, and select the corresponding options.

Step 2. Switch to the Tools tab, click Ransomware Protection.

Step 3. Toggle the Enable Ransomware Protection tab to enable it. Then, specify file type, files, folders to enhance data security.

  • The backup images created by AOMEI Backupper is protected automatically.
  • Enter the file extensions you frequently use to protect specific file types.
  • Enter specific folder paths, such as C:\Program Files (x86), C:\ProgramData, etc., to protect important files and folders.

Step 4. Once enabled, you’ll be asked to add apps to trust or block list. Check the specific app and click Add to Trust List or Add to Block List. Or simply click Ignore.

Step 5. Switch to Trust List, Block List, and Block History and manually configure them.

📍📍📍Notes:
✅ Add trusted or blocked apps or folders and decide if they can modify or delete protected files or folders.
✅ In the Block History window, you have 3 options: Clear Block History, Add to Trust List, or Add to Block List.

In sum, AOMEI Ransomware Protection protects backup images created by AOMEI Backupper and keep it intact intact even after an attack. You can choose to restore system in the recovery environment. Please create a recovery disk to start the computer without access it. Once loading, you can:

  • Under the Home tab, click Restore. Then, select the latest system backup task to restore.
  • Check Restore this system image.
  • Check Restore to new location and select a new hard drive. At last, click Start Restore.

Final Thoughts

Backups are the safest method to perform Ransomware recovery after an attack. While security tools can help prevent infections, no solution is foolproof. Having verified, malware-free backups ensures that you can restore data quickly and reliably, minimizing downtime and preventing permanent loss.

The most effective defense combines regular backups with active ransomware protection, like AOMEI Ransomware Protection. This layered methodnot only protects your data but also monitors and blocks suspicious behavior, giving long-term resilience against ransomware threats.

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