MySQL 8.0 Reference Manual Including MySQL NDB Cluster 8.0 NDB Cluster Backup Concepts

A backup is a snapshot of the database at a given time. The backup consists of three main parts:

Each of these parts is saved on all nodes participating in the backup. During backup, each node saves these three parts into three files on disk:

In the listing just shown, backup_id stands for the backup identifier and node_id is the unique identifier for the node creating the file.

The location of the backup files is determined by the BackupDataDir parameter.