Air gapped backup essentially means creating a physical copy of important data on a separate storage device that is not connected to any network or the internet. This could be in the form of an external hard drive, tape drive, or even a USB flash drive. The physical separation ensures that the data cannot be accessed by hackers from remote locations.
This method of backup is commonly used for highly sensitive and confidential information such as financial records, trade secrets, and personal data of customers. By keeping an offline copy, companies can ensure that their data remains secure even if their network or online systems are compromised.