How to back up files in the event of a ransomware attack?

To back up files effectively in the event of a ransomware attack, follow these best practices:

1. Use the 3-2-1 Backup Strategy

   • 3 copies of data: Keep at least three copies of your data (one primary and two backups).
   • 2 different storage types: Store backups on at least two different types of media (e.g., external hard drive + cloud storage).
   • 1 offsite backup: Ensure one backup is stored offsite or in an isolated environment to prevent ransomware from encrypting it.

2. Implement Immutable Backups

   • Use backup solutions that offer immutable (write-once-read-many) storage, preventing ransomware from modifying or deleting backups. Many cloud backup services provide this feature.

3. Automate Regular Backups

   • Schedule automated, frequent backups (daily or hourly, depending on data criticality) to minimize data loss.

4. Isolate Backups from the Network

   • Store backups on air-gapped systems (physically disconnected from the network) or use backup solutions with network isolation to prevent ransomware from spreading.

5. Test Backup Restorations

   • Regularly test restoring files from backups to ensure they are functional and not corrupted.

6. Monitor for Ransomware Signs

   • Use security tools to detect unusual file activity (e.g., sudden mass file extensions changes) before a full attack occurs.

Example:

A business uses an external hard drive (local backup) and a cloud backup service with immutable storage (offsite). They automate daily backups and test restorations monthly. If ransomware encrypts their files, they can restore from the immutable cloud backup without paying the ransom.

For cloud-based backup, consider using a reliable cloud storage provider with built-in ransomware protection, versioning, and immutable backups. These services often include automated backups, encryption, and quick recovery options to minimize downtime.