As database backups can grow substantially in size, compressing backups
helps to preserve disk space.
While the mariabackup utility offers no compression by itself, we can
stream the backup into a compression tool to create an archive [1].
The xtrabackup_checkpoints file, which contains metadata on a backup,
gets stored alongside the archive, allowing to create incremental
backups from non-compressed backups and vice-versa [2].
One thing to note, is that compressed backups cannot be prepared in
advance, this step must be manually carried out by the user.
Backup compression is disabled by default and different compressors
can be chosen (zstd, xz, ...), with gzip being the default.
[1] https://mariadb.com/kb/en/using-encryption-and-compression-tools-with-mariabackup/
[2] https://mariadb.com/kb/en/incremental-backup-and-restore-with-mariabackup/#combining-with-stream-output
Change-Id: I28c6a0e0b41d4d29c3e79e601de45ea373dee4fb
Signed-off-by: Simon Hensel <simon.hensel@inovex.de>
60009ed7ce