1.3.2 Files Backed up for InnoDB Data

The InnoDB-related data files that are backed up include the ibdata* files (which represent the system tablespace and possibly the data for some user tables), any .ibd files (which contains data from user tables created with the file-per-table setting enabled), and the data extracted from the ib_logfile* files (the redo log information representing changes that occur while the backup is running), which is stored in a new backup file ibbackup_logfile.

If you use the compressed backup feature, the .ibd files are renamed in their compressed form to .ibz files.

The backed-up files, as they are originally copied, form a raw backup that requires further processing. The apply step (either as part of a copy-back-and-apply-log command or a backup-and-apply-log command, or as a separate apply-log command) updates the backed-up files based on the changes recorded in the ibbackup_logfile file. At this point, the data corresponds to a single point in time.


To avoid concurrency issues during backups of busy databases, you can use the --only-innodb option to back up only InnoDB tables and the associated data.