XtraBackup是Percona公司的开源项目，用以实现类似Innodb官方的热备份工具InnoDB Hot Backup的功能，它支持在线热备份(备份时不影响数据读写)。到目前为止，最新的版本为Percona XtraBackup 2.4.7.
XtraBackup有很多功能和优点：例如支持全备、增量备份、部分备份；支持压缩备份；备份不影响数据读写、事务等，但是也有缺陷不足：例如不支持脱机备份、不支持直接备份到磁带设备、不支持Cloud Back，MyISAM的备份也会阻塞。不过这些小瑕疵不影响XtraBackup成为一款流行的MySQL备份工具。另外，请注意XtraBackup只支持Linux平台，不支持Windows平台。
下面是XtraBackup的官方文档的介绍资料：
Percona XtraBackup is the world’s only open-source, free MySQL hot backup software that performs non-blocking
backups for InnoDB and XtraDB databases. With Percona XtraBackup, you can achieve the following benefits:
• Backups that complete quickly and reliably
• Uninterrupted transaction processing during backups
• Savings on disk space and network bandwidth
• Automatic backup verification
• Higher uptime due to faster restore time
Percona XtraBackup makes MySQL hot backups for all versions of Percona Server, MySQL, and MariaDB. It performs
streaming, compressed, and incremental MySQL backups.
Percona XtraBackup works with MySQL, MariaDB, and Percona Server. It supports completely non-blocking backups
of InnoDB, XtraDB, and HailDB storage engines. In addition, it can back up the following storage engines by briefly
pausing writes at the end of the backup: MyISAM, Merge, and Archive, including partitioned tables, triggers, and
database options.
Percona XtraBackup的特征：
Features
Percona XtraBackup
License
GPL
Pirce
Free
Streaming and encryption formats
Open source
Supported MySQL flavors
MySQL, Percona Server, MariaDB, Percona XtraDB Cluster, MariaDB Supported
Supported operating systems
Linux
Non-blocking InnoDB backups
Yes
Blocking MyISAM backups
Yes
Incremental backups
Yes
Full compressed backups
Yes
Incremental compressed backups
Yes
Fast incremental backups
Yes
Incremental backups with archived logs feature in Percona Server
Yes
Incremental backups with REDO log only
Backup locks
Yes
Encrypted backups
Yes
Streaming backups
Yes
Parallel local backups
Yes
Parallel compression
Yes
Parallel encryption
Yes
Parallel apply-log
Yes
Parallel copy-back
Partial backups
Yes
Partial backups of individual partitions
Yes
Throttling
Yes
Backup image validation
Point-in-time recovery support
Yes
Safe slave backups
Yes
Compact backups
Yes
Buffer pool state backups
Yes
Individual tables export
Yes
Individual partitions export
Yes
Restoring tables to a different server
Yes
Data & index file statistics
Yes
InnoDB secondary indexes defragmentation
Yes
rsync support to minimize lock time
Yes
Improved FTWRL handlin
Yes
Backup history table
Backup progress table
Backup to tape media managers
Cloud backups support
External graphical user interfaces to backup/recovery Zmanda Recovery
Zmanda Recovery Manager for MySQL
XtraBackup下载