Index of files created by Percona XtraBackup¶

Information related to the backup and the server
- backup-my.cnf
This file contains information to start the mini instance of InnoDB during the xtrabackup --prepare. This is NOT a backup of original my.cnf. The InnoDB configuration is read from the file backup-my.cnf created by innobackupex when the backup was made. xtrabackup --prepare uses InnoDB configuration from backup-my.cnf by default, or from xtrabackup --defaults-file, if specified. InnoDB configuration in this context means server variables that affect data format, i.e. innodb_page_size option, innodb_log_block_size, etc. Location-related variables, like innodb_log_group_home_dir or innodb_data_file_path are always ignored by xtrabackup --prepare, so preparing a backup always works with data files from the backup directory, rather than any external ones.
- xtrabackup_checkpoints
The type of the backup (e.g. full or incremental), its state (e.g. prepared) and the LSN range contained in it. This information is used for incremental backups. Example of the xtrabackup_checkpoints after taking a full backup:
```
backup_type = full-backuped
from_lsn = 0
to_lsn = 15188961605
last_lsn = 15188961605
```
Example of the xtrabackup_checkpoints after taking an incremental backup:
```
backup_type = incremental
from_lsn = 15188961605
to_lsn = 15189350111
last_lsn = 15189350111
```
- xtrabackup_binlog_info
The binary log file used by the server and its position at the moment of the backup. Result of the SHOW MASTER STATUS.
- xtrabackup_binlog_pos_innodb
The binary log file and its current position for InnoDB or XtraDB tables.
- xtrabackup_binary
The xtrabackup binary used in the process.
- xtrabackup_logfile
Contains data needed for running the: xtrabackup --prepare. The bigger this file is the xtrabackup --prepare process will take longer to finish.
- <table_name>.delta.meta
This file is going to be created when performing the incremental backup. It contains the per-table delta metadata: page size, size of compressed page (if the value is 0 it means the tablespace isn’t compressed) and space id. Example of this file could looks like this:
```
page_size = 16384
zip_size = 0
space_id = 0
```
Information related to the replication environment (if using the xtrabackup --slave-info option):
- xtrabackup_slave_info
The CHANGE MASTER statement needed for setting up a slave.
Information related to the Galera and Percona XtraDB Cluster (if using the xtrabackup --galera-info option):
- xtrabackup_galera_info
Contains the values of wsrep_local_state_uuid and wsrep_last_committed status variables

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