These options control the generation of metadata about backups.
        Some metadata is stored in the backup directory, other metadata
        is stored in tables within the mysql database
        of the backed-up instance.
- Turns off the recording of backup progress and history in logging tables inside the backed-up database server. See Section 17.3, “Using the MySQL Enterprise Backup Logs” for details about these tables. - Default: history logging is enabled. 
- 
Command-Line Format --comments=STRINGType String Specifies a comment string that describes or identifies the backup. Surround multi-word comments with appropriate quotation marks. The string is saved in a file meta/comments.txtin the backup. For example:--comments="Backup of HR data on 2010/12/10".
- 
Command-Line Format --comments-file=PATHType File name Specifies path to a file containing comments describing the backup. This file is saved as meta/comments.txtin the backup. For example:--comments-file=/path/to/comments.txt.This option overrides the --commentsoption if both are specified.