Which type of backup makes an image that is a complete copy of all data?

A full backup is characterized by creating a complete copy of all data within a specified system or storage location. This type of backup captures every file, folder, and database in its entirety, allowing for a full restoration of the data as it existed at the time the backup was executed.

The significance of this method lies in its ability to enable straightforward recovery of data in the event of loss or corruption, as all necessary files are contained in one backup set. Unlike incremental and differential backups, which only capture changes since the last backup, a full backup ensures that users have a comprehensive dataset available.

Snapshot backups, while similar in that they capture the state of the system at a particular moment, don't always create a complete standalone copy of all data. Instead, they often rely on block-level changes and can depend on existing backups to fully restore data.

Therefore, a full backup is the correct choice for creating an image that represents all data, providing the highest level of data integrity and recovery options.