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MySQL Enterprise Backup 3.11 User's Guide
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3.1.3 Designate a Location for Backup Data

All backup-related operations either create new files or reference existing files underneath a specified directory that holds backup data. Choose this directory in advance, on a file system with sufficient storage. (It could even be remotely mounted from a different server.) You specify the path to this directory with the --backup-dir option for many invocations of the mysqlbackup command.

Once you establish a regular backup schedule with automated jobs, it is preferable to keep each backup within a timestamped subdirectory underneath the main backup directory. To make the mysqlbackup command create these subdirectories automatically, specify the --with-timestamp option each time you run mysqlbackup.

For one-time backup operations, for example when cloning a database to set up a replication slave, you might specify a new directory each time, or specify the --force option of mysqlbackup to overwrite older backup files.