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MDEV-16457 mariabackup 10.2+ should default to innodb_checksum_algori…
…thm=crc32 Since MariaDB Server 10.2.2 (and MySQL 5.7), the default value of innodb_checksum_algorithm is crc32 (CRC-32C), not the inefficient "innodb" checksum. Change Mariabackup to use the same default, so that checksum validation (when using the default algorithm on the server) will take less time during mariabackup --backup. Also, mariabackup --prepare should be a little faster, and the server should read backups faster, because the page checksums would only be validated against CRC-32C.
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