To save disk space, you can compress InnoDB backup data files by
--compress option of
mysqlbackup. Compression lets you keep more
sets of backup data on hand and save on transmission time when
sending the backup data to another server. The downside includes
the extra CPU overhead during the backup itself and the extra
time needed for the restoration process for uncompressing the
The backup compression feature works only for InnoDB tables.
After the InnoDB tablespace files are compressed during backup,
they receive the
.ibz extension rather than
.ibd extension. To avoid wasting
CPU cycles without saving additional disk space,
--compress does not attempt to compress
already-compressed tables that use the Barracuda file format;
such tablespace files keep the usual
When there is unused space within an InnoDB tablespace file, the entire file is copied during an uncompressed backup. Perform a compressed backup to avoid the storage overhead for the unused space.
You can also select the compression algorithm to use by the
--compress-method option and, when
using the ZLIB or LZMA compression algorithm, the level of
compression by the
option. See Section 5.1.7, “Compression Options” for
This is a sample command for making a compressed backup:
mysqlbackup --defaults-file=/etc/my.cnf --compress --compress-level=5 backup
This is a sample command for making a compressed single-file backup:
mysqlbackup --defaults-file=/etc/my.cnf --compress --compress-level=5 \ --backup-image=backup.img backup-to-image
Make a note of the LSN value in the message at the end of both the full and incremental backups (for example, in the line
mysqlbackup: Was able to parse the log up to lsn). You specify this value when performing incremental backups of changes that occur after this full backup.
Apply the log to the compressed backup files, so that the full backup is ready to be restored at any time. You can move the backup data to a different server first, to avoid the CPU and I/O overhead of performing this operation on the database server.
After applying the log, periodically take incremental backups, which are smaller and can be made faster than a full backup.