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InnoDB binlog files are now backed up along with other InnoDB data by mariadb-backup. The files are copied after backup locks have been released. Backup files created later than the backup LSN are skipped. Then during --prepare, any data missing from the hot-copied binlog files will be restored by the binlog recovery code, and any excess data written after the backup LSN will be zeroed out. A couple test cases test taking a consistent backup of a server with active traffic during the backup, by provisioning a slave from the restored binlog position and checking that the slave can replicate from the original master and get identical data. Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>