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You can back up MariaDB 10 and restore it to a previous version via Hyper Backup.
To back up MariaDB 10:
Go to Hyper Backup > Create > Data backup task to create a backup task.
Follow the Backup Wizard, and choose MariaDB 10 when you are prompted to select applications to back up.
After the backup task is complete, all the MariaDB 10 databases will be backed up.
To restore MariaDB 10:
Go to Hyper Backup > Restore > Data to restore the desired backup task.
After the restore task is complete, the current settings and data of MariaDB 10 will be overwritten.
All the MariaDB 10 databases will be mandatorily backed up or restored. The backup and restore functions will fail if the database name contains \ or `.
For more details, contact your Synology provider or use Synology Support-Centermaria db mariadb synology